There really is no going back when you go split and tented. I've was on a Kenesis Freestyle for years, then upgraded to a Dygma Raise (V1) about three years ago. It's served me well, but I've been eyeing a CyBoard Imprint, which is like a Dactyl or Charbydis, but has hot swap-able switches (a rarity for curved key-well boards.) Can't give up my holy panda switches. :)

I went back - really don't like the wobble of the Kinesis keys. Ironically I prefer just an Apple keyboard since it matches my laptop (making going back and forth easy).

I've been rocking the Dygma Defy since it came out and it's been amazing. Their software has been buggy though, and left me rebuilding key maps more than once. I just wished it had a rotary dial