Haha, thankyou! I was being a little cheeky there though :) I think my real speed would only really be about 100-110. 10 fast fingers is a very simple test without any punctuation or similar, but it is very nice for benchmarking. On the advanced test I don't do nearly as well.

Unfortunately haven't had the opportunity to actually practice or record my wpm the last month or two. Though, just did a quick test tonight and managed a new record for myself!

I'm planning to make the change to a columnar staggered keyboard at some point in the coming months, so my WPM will likely take a hit. Not sure if I will switch M and K in Colemak-DH, will have to see how I feel. What do you guys think?

I downloaded Colemak-DH for the first time on May 14th 2017. My original post has a history of all of my records at the bottom as I got them with a date. It took me a little over a month to get to 100wpm. Once I got to above 90 wpm or so I stopped practicing daily and just used my keyboard like a normal person :P

I thought about trying Iris as well, but so far I'm using Ergodox. (That is a good thing about custom keyboards, they all have a name :) )
I'm using the latest variant of Colemak Mod-DH on Ergodox. Did not think about swapping M and K yet, IMO the stretch to the "qwerty N" will be noticeable anyway. I'm not as fast typist as you are, it would be interesting to hear your opinion.
BTW, what is good about Ergodox, the "qwerty B" and "qwerty N" can be reached by the thumb. I do not use that for now to do not create habits which can be used on Ergodox only.
Also, on reddit I heard opinion of one guy who tried Colemak, Workman, Colemak DH, and then came back to Colemak, that both at Workman and Colemak DH he "started feeling the upper limit of speed" and "couldn't really break past 50 wpm comfortably". I do not agree to him, what do you think about that?

Hmmm, interesting. Strangely though, he was bugged by the default Colemak centre column issue - which Mod-DH fixes - but then says "I appreciate the rhythm of typing across the home row [on Colemak] more than what Mod-DH had". Obviously the home rows are identical except for fixing the centre column! So I don't really understand his point.

I suspect the problem is he has arbitrarily switched layouts too frequently, without giving them a fair shot. Getting your speed up takes time, and I get the sense he was a bit impatient.

I don't think it's possible for there to be any significant speed difference between DH and standard Colemak, as they are so similar. The only real difference is one of comfort thanks to the improved D/H, the angle mod, and avoidance of the awkward HE.

Yeah, I also thought about the "floaty" typing style, then IMO rolling across the home row (including middle columns) might be appreciated. This is the first time though when I see that somebody who used  Colemak and gave Colemak DH a try then came back to Colemak.

Having the huge thumb cluster in ErgoDox does not mean you obligated to use it. ;) I'm effectively using just the closest big button and occasionally the second big button, the rest of thumb cluster has keys assigned, but they are not used in touch-typing. I actually have the core layout of Ergodox repeating my layout of Let's Split (which have 48 keys only), the rest of keys are treated as enhancement (including the number row). Same as the full keyboard, having 104 keys does not mean you use them all on daily basis, but they may be convenient sometimes. Also, ErgoDox is a kind of mainstream of columnar keyboards.

That's interesting, what types of keys have you got on these extra keys? I can think of a few things that just being able to tap on demand (no layer) is definitely nice. For example print screen and F5 are two that I find myself wanting a dedicated key for. Tends to be infrequent keys that I mostly use when my hands aren't already on the home row. I was thinking of getting a dedicated macropad that I could have to the left of my keyboard for these types of keys. Possibly other things like opening applications too.

It definitely seems that way, almost like you might say some people just have great athletic potential, some people have great typing speed potential!

Did a few attempts today and managed a new high score for myself, 127 WPM! Making me really want to reach 130 WPM at some point now.

My split columnar-staggered keyboard is also arriving in a day or two so that will be built soon and I will hopefully switch to that full time quickly. Super excited for that and will be sharing my feelings of Colemak-DH in that layout rather than ordinary staggered soon!

Interesting, that stagger looks only very small, it's surprising that it's noticeable.
The four keys on the four difficult corners are B J V M, which are all fairly rare except M. So you could to the M-K switch as per original Mod-DH. Or, since you say the top-corner keys are easier, another option might be to switch M-J?
I would have expected Z X C (and D) to be perfectly good with this board though.

Columnar staggering of Iris is repeating the one for ErgoDox and this is a kind of standard now.
I personally find the inner column shift ok. Index finger is moving by arch there, while in ortho layout it is required to swing and stretch it a little from homing position.
What is different for Iris compare to ErgoDox is the middle thumb key position. In ErgoDox it is right below the index column and many users do not press it with thumb, while that position is too good to use it for anything but thumb key. Then, ErgoDox has a little gap between keys which allow to reach V and M with thumb. I’ve tried to do that and rotated V and M cups upside down to press them easier with thumb, but now I’m not using that to do not create ErgoDox only habits.
Regarding the M and K position, I’ve used M in the home row for some time, what was bugged me is MN and MEN, I find it more convenient when M is in the bottom row. K in the middle is not as good for KN, but it is more convenient for CK, which is IMO is very frequent. I’ve noticed great improvement for ING and CK after moving from Colemak to Colemak DH, and both ending letters G and K took the middle row position.
M is kind of can not find its optimal spot on the keyboard. But just think about that columnar staggering is used for qwerty where there is N in that position, and users still report great ergonomic improvement compare to row staggering.
Also, I’m using split keyboards separated for about palm width and quite aggressively tented for about 20°. I was not immediately got used to it, but now I find it very convenient.

I see that on this particular keyboard the top-corner key is actually a lot more accessible than on other keyboards – even standard matrix ones. On those, I would think that the position is still bad. In fact, using the Curl(DH) mod shifts finger focus downwards so these positions become worse than in vanilla Colemak! It's a small concession to make I believe, since they're occupied by the rareish B and the rare J.