Hello,
I have decided to register since I have found interest in learning Colemak.
Let me introduce myself first: I am a competition-driven typist on several Typing-related sites such as TypeRacer, 10-Fastfingers, Typera.tk and so forth, who is highly accomplished in both Qwerty and Dvorak. I grew up using Qwertz and switched to Dvorak in December 2012. I generally type in English and German and can achieve peak speeds of over 150 in German and over 170 in English. My overall average lies between 135-145 wpm. This is a speed that I can sustain over a longer period of time and/or on more difficult content. My personal best is 185 wpm on TyperRacer (the quote that I typed my PB on can coincidentally be seen in a video of Reckful: https://www.youtube.com/watch?v=7xTDvYPPYn8). My personal bests at 10-Fastfingers are 174 for the normal English test and 154 for the advanced test (167 wpm / 143 for German). All my PBs were achieved on Dvorak using the Das Keyboard Model Ultimate. As far as Qwerty is concerned, my average wpm is about 25 slower on that layout. The difference is most significant for the English language, not so much for German. However, Dvorak was still a game changer in both languages for me.
I am quite happy with my current speeds and regularly manage to be high in the ranking lists of the most popular typing site. So, why the change? It is born out of pure curiosity and the human aspiration for more. I know that with a lot of training and dedication I have pretty much achieved my limit on Dvorak. I cannot go much faster. So I'm looking forward to learning Colemak and I will begin soon. My experiment might be quite interesting since I have not yet stumbled upon a very fast Dvorak typist who switched to Colemak or vice versa. It was quite interesting to read that the already Qwerty-accomplished typist by the nickname of Viper did so great after switching to Colemak. However, I don't think that I can ever achieve a 200 wpm run on 10-Fastfingers with Colemak as he was nearly able to match my current Dvorak speed on a Qwerty layout. You cannot disregard the importance of talent when it comes to world class feats. Dvorak is already a neat layout and I do not think that Colemak is much more superior.
My quite intuitive guess is that I will max out my Colemak speed after a year or so and that it will give me 10 wpm more at best. I downloaded the Colemak version without the removed capslook for the sake of the delete key as I am using caps lock instead of the left shift key (read "Typing tips from the fastest typist, Sean Wrona" if you want to know why that is better).
Thanks for your attention.