Probably already answered...but here goes.
I have been using it extensively on dives since I purchased it, from off the coast of NC to the Saint Lawrence River and Lake Ontario.
Summary: Temps: 35F and below....don't do it. 35-40F 20-30 minutes, 41 to 65F, pleasant!, 66-75F, ok, but watch yourself, above 76F, no way.
Long story short, I love it, I use it extensively, I have owned 2 of them since this review started.
I wear a Medium and am 5'7" 178LBS, athletic build, suit fits well, even the hood. But for the gent that said he had hood fit issues, maybe trim it a bit? It does say (in the manual) you may need to trim it to fit it properly.
Using it in high 70s+ I wouldn't, I used it in 78 degree water on a beach dive and almost died of thermal exhaustion kicking back in and I am pretty fit, I had to unzip the chest zip and swim with all that extra drag. Anything in high 60s to low 70s or above I would use a 5m or 3m or nothing 84F in Truk I was diving to 180 feet in T-shirt and shorts.
In answer to keeping your feet and hands warm....I just use boots or gloves that I pull over the outside of the suit, works fine....even in high 30s water (for me). Though I'll admit, I won't stay longer than 30-40 minutes in this suit at those temps at depth. When I wear neoprene socks, same thing I pull it over the suit, not under it.
Lets see, Lake Ontario....I was fine until I passed 90 feet in November or December...it got cold quick and was uncomfortable after 30 mins. Deco was a bitch at deep stops on some of the dives I was on.
Saint Lawrence river was great top to bottom....but not much temperature change there.
Quarries, there are a number where I live, I use them to train....most are ok, One of them (Millbrook I think) Is absolutely miserable below 30 feet for me in this suit, and I tolerate cold well. Above 30 feet, even in winter I swam with the hood off, below the thirty foot platform, it was mid 30s and miserable. I couldn't do more than 20 mins.
Lets see, other things, it fits me well, though I have had two now in different sizes, so I see length issues presenting themselves (usually being too long). I don't have buoyancy issues with it at all, but I dive doubles all the time, either twin 100 steels or twin 80 ALs, no extra weight need for either, that is with or without two AL 40s for deco gasses. I don't have pulling issues, tightness issues etc... I did have issues when I wore a suit that was a size too small in the chest for me in getting it zipped closed, I could get it closed but I needed assistance. Same suit also made me feel like I was choking every now and then, due to the think neck dam it has.
I think that's it, be happy to answer any specific questions anyone has, and if someone wants me to try it somewhere or in some condition just ask, not only will I do it but be happy to take pictures and video too. If anyone is in VA or close by, just let me know and I would be happy to meet you with it so you can check it out too.