So I did my first dives with this suit. It is a great suit. I dove on a couple beaches at Monterey, with the water apparently 48 or 50F. First, the suit is incredibly comfortable. Snug without pinching or stifling. I used it along with a Pinnacle 7mm hooded vest, XS Dry 5 gloves, and Henderson H2 7MM boots. I recommend zipperless boots, zippered boots with a covered zipper, or wear zippered boots over the suit's leg cuffs. Otherwise, they could damage the smoothskin cuffs. I did two dives 45 minutes dives each day, and I didn't notice the cold at all. It felt like I could have stayed in the water for 2 hours without an getting cold. It is definitely not a semi-dry suit, but because of seals, there is absolutely no flushing and the water you first get into the suit stays in the suit. The coldest I got was taking the suit off after I was done for the day. I met a woman who was wearing a Mares Trilastic 8.6.5 and it seems to be the same suit but for women. We compared notes and both of us seemed to have the same, positive experiences: no getting cold, no flushing, very comfortable. While I was expecting a semi-dry experience and it turned out not be be the case, I was still very toasty. It was definitely better than the 7mm XCEL rental the shop was providing. I'm thinking it will stand up to any 7mm suit. I highly recommend it.