The used suit I bought is a White's Fusion Tech. I spent an hour in a pool in Fusion tech during an AquaLung demo last summer. Okay, I get that I was only at 12', but maintaining buoyancy and trim seemed pretty straightforward, once I emptied air out of my wing and after fussing with the placement of the lead a bit. At least I could fin around a few inches off the bottom, and hover as long as I wanted. Of course, when I got out of the suit I was absolutely SOAKING wet. So much so I swore the suit had leaked, until I realized it was all sweat.The pain of the transition will depend a bit on your DS. A trilam suit with good room for a thick undersuit is a bit of a PITA to become comfortable in due to air travel and the amount of weight you need to sink all the air in your undergarments. A snug, body-fitting neoprene suit like the Fusion or a Scubapro Everdry is almost (but not quite) as easy to dive as a wetsuit, IMO. Little air that will wander and good stretch makes the experience more wetsuit-like. Not quite, but noticeably closer.
OBTW, has AquaLung made any significant changes to the Fusion Tech since buying Whites? (not counting optional wrist and neck seal systems or other doodads.)