I got used to colemak placement of L but somehow find it not comfortable - on laptop and MS4000. The stagered rows make it ackward for combinations of L and E. Just recently I thought that there is no penalty with swapping L with M. Thus LE and EL becomes very comfortable, however EM and ME is also common.
Other rolls also seems to appear equally often: MU, MY.
For me the real ackward thing is EL(, LE is somewhat easier). Does anybody here have statistical data if the swap could make sense - thus if EM is less frequent than EL?