Three Button- Thumbs up
One Button- Thumbs Down
I own a 99 R1100S with the proper three button arrangement, it's not my first bike (93 yamaha Seca II) but like Paul said, it took less than five minutes for me to get used to the BMW system.
Recently, I had the opportunity to test ride a 08' (or 09'?) K1300GT for seven days with the newer one button signal arrangement. Although I don't really see it as a deal breaker, the one button arrangement really just seems cheap feeling. I can't help but think that the change is cost related for BMW, meaning they're saving money by adopting the conventional arrangement. Less plastic, fewer parts. It's my opinion, of course.
The three button arrangement just seems more substantial to me. And I'd be more interested in looking for a 1200GT partly because of the signal switches and urine cup looking fluid reservoir.
...so I suppose the switches are a dealbreaker?
Maybe I've finally lost my mind?