I had the kinesis advantage 3 for a little over a week. I have to say by far the most comfortable keyboard I have every used. I returned it because I didn't have the spare time to "adjust" to the layout. Its funny its been months and I still miss the feeling lol.
A week? Well, how much time do you expect to spend typing over the next 10 years...?
It took about a month or two to adapt IIRC. I would suggest to remap and reconfigure some keys/layout after observing your actual usage. Also change a few uncomfortable application key combos and relearn, especially if you're not using a US layout.
Reprogramming (swapping) keys is easy, but I admit it was a big hassle to also keep a custom layout synced/working between Windows and Linux over the years. But it's great once it's done.
By now I'm owning three kinesis advantage, one at the office, one at home, and one to make sure I never have to type on a flat keyboard ever again if anything breaks. I get RSI just from looking at those.
I also tried a fully split (freestyle2) keyboard, but it didn't work for me. I think it was the lack of the bowl shape.
