Here's the advice that I gave the last time that question was asked (normally I'd just link it, but I got so many positive PMs that I that I thought it appropriate to edit it and repost it):
The bottom line is that for dive gear, real information is hard to come by. Most of the opinions that you see on the net are biased either by being the only piece that class of gear that a diver has ever used or being a loaner that the expert tried out on one or two dives. The thing that you need to do is find an expert who is doing the kind of diving that you plan on doing, and ask him or her about the gear. That may well not be an Instructor. Don’t be afraid to bore on in, why … why … why. If you do not get answers that you understand, find another expert. Make sure that the advice makes sense in terms that you understand. When the advice makes sense, buy the gear and never look back.
A short tale to illustrate the point:
I issue a very detailed equipment list before each class that students where were accepted into the class need to purchase and show up with at the first meeting. Each item is specified as closely as possible (and you thought DIR divers all dressed alike!).
The suits we were using at the time were, as I’ve mentioned elsewhere, 5mm, skin two side, Rubatex GN-231N, attached hood, farmer johns, no zippers. I send my list to all the LDSs in the area and give the students copies of the “bids” that they send back (this is a big deal, twenty full sets of gear with no selling or inventory required: take the order, take the money, deliver in two weeks).
One student did not go to one of these LDSs, but rather, to a shop near her home (about a hundred miles away). I got a call from the Instructor in the shop telling me, in a rather emphatic tone, that, “No diver could possibly wear this suit. They could not put it on without, at least, an inverted chest zipper.” Now, please understand that I’ve been diving this suit design since the mid sixties, and the only people who need such a zipper are incredibly curvaceous women that are of petite statue. This woman was just shy of six foot and she was what some would call, “a javelin.”
Having nothing better to do (and considering that the woman in question was one of the brighter marine geologist grad students), I drove up to the shop later in the day, bringing my suit with me. I showed the Instructor how easy it was to put on and take off, etc. We solved the problem, but the bottom line was that this Instructor, well meaning as she was, had not yet worn out here first suit and was just repeating what her Instructor’s had told her (trusting that said Instructor knew his butt from a hole in the pavement). It wasn’t a marketing issue; the LDS could and did supply the gear (and nicely matched the prices of the LDSs that had sent fliers). So be careful the advise that you pay attention to, all too often, when your dealing with multi-thousand dollar pieces of gear, “Well … I think this is the best” loosely translate to, “I spent twenty-five hundred dollars on this and it have better be the best, but I have no way of actually comparing.”