I just bought a dos last week for a couple of reasons, but one is that the price is low due to the fact they are/will be discontinued. They will be replaced by the "Tres". Since they discontinued production, sizes are limited, though you can find them in other sizes if you look hard enough in on-line stores.
This is my first wetsuit, so take what I say with a grain of salt. Also, be sure to read reviews on this site and others. I liked it. It was difficult to put on when dry, and needed a hand to pull the back down. It felt fine in the pool, and removing it was pretty easy when the suit was wet. Check out
www.t1wetsuits.com for a quick-time movie on how to remove it. It was pretty comfortable, though I only swam a few hundred yards. I purchased it due to potential comfort savings (compared to one-piece suits) in longer races I plan on doing.