I've had the 188 TT's for a year, although I havent' skied them for a couple months since I lost one at Snowbasin in Dec and just got it back. The ski is damn good everywhere. It's great in the pow, smooth, easy turning, feels about perfect except it would be nice if it was wider, you're just down in the snow a bit more. It rips the hardpack great too, excellent edgehold, I can even get a bit of pop out of the turns, I'm 5'11, 165.
I mounted mine 1.5cm back which is where the demo was mounted that I skied at Alta, so I had them mount mine the same. It feels great everywhere except in tight trees is feels a bit long radius, I would probably go a bit more forward on the mount if I wanted to ski a lot of trees, I was on the first gen Gotamas for 3 years, and they were a bit more surfy and smearable in the pow but not as versatile as the TT.