So if you are switching keyboards all the time say from the UHK on your desktop to your laptop keyboard then your muscle memory is going to get a bit confused and keys aren't as easy to subconsciously hit. The mouse layer on the UHK is incredible and I find I try to use it all the time on other keyboards which obviously don't have it. Also function keys and escape haven't been as big a problem as I thought they would. Your brain just adapts quickly. One thing is that I do have trouble getting used to split mode because the halves move around slightly and my muscle memory doesn't know exactly where keys are. I tend to leave the halves together.