I've had my 7mm Greenprene suit for a year now, and I've done a little over 50 dives in it (the rest of my dives have been in my drysuit.) I'm happy with it. It's pretty much indistinguishable from the Thermaxx I had before--maybe a tiny bit warmer? The Thermaxx I had before developed a thin spot just below the zipper after about 100 dives, which I think may have been due to the suit not being a perfect fit. Henderson sizes are a bit weird; I'm a 12 in every other brand, but I was swimming inside Henderson's 12. So I bought the 10 Tall, which is close, but maybe too short in the torso or too small in the hips/butt. I'm also thinking maybe I put extra strain on the material by zipping myself up instead of having my buddy do it, which I do now. At this rate it'll be another year before I can speak to durability, but so far I'm optimistic.
ETA: Both suits are/were delightfully stretchy and easy to don and doff.