I got Reactive 3 and 5mm suits after my last post in this thread. I got them about 3 years ago. So, they were 1st Gen, but not the early first gens. I mentioned above about issues with the main zipper. Before I bought mine, I talked to my Bare rep about that and he said that they had fixed that issue.
I switched from ScubaPro EverFlex 3/2 and 5/4 suits (which I still have) to the Bare. About 4 months ago, I got a new Waterproof W7 in 5mm and sold my Bare 5mm.
My experience: The Reactive suits are very warm for the thickness they are. Also, the new (2nd gen, that just came out in the last few months) Reactive suits are claimed to be 30% warmer. If they are ANY warmer, then they must be really darn warm. I feel good about saying that my Reactive suits are the warmest suits I've used (in their respective thicknesses).
I have dived my Reactive 5mm:
71 minutes in 54F water
50 minutes in 51F (later on same day as previous)
68 minutes in 55F water (totally different weekend)
Those were with the Bare Ultrawarmth 7/5 hood, Bare Ultrawarmth 5mm boots, and Bare Ultrawarmth 3mm gloves, and nothing else.
Since I moved the Bare 5mm on and get the W7 5mm, I have done 49 dives in the W7.
It's hard to really say, but I think the W7 is not quite as warm, in the sense of holding heat in via insulation. And maybe not QUITE as warm overall. But, in contrast to the Reactive, the W7 seems to keep me about as warm overall by virtue of having better seals and not letting water flush through quite as easily.
The Reactive suits seal up at the wrists and ankles very well. But, the seals on the W7 are pretty much semi-dry suit seals, so they seal up the suit even better.
Be aware that Bare sizing can be a bit retarded and you can't necessarily go by their sizing chart. ESPECIALLY if you are a "thick XL" or "short XXL" (which is me, either way you describe it). For their wetsuits, if you are in between, I would definitely suggest to choose the smaller size. I'm way thicker than recommended for a Bare XL, but that is what I wear. XXL is too long in the arms and legs for me. XXL Short is way too short in the torso for me. The XL was a bit more snug than I like, around my torso, but not to the point of being uncomfortable.
Also, I wear size 10.5 - 11 shoes. In the Bare boots, I had to get their size 9 and even those are just a little too big for me. I wear 2mm neoprene socks with them, just to make them wearable.
The Bare hood is awesome and true to size. I switched to the Waterproof H1 hood and it is also awesome. I have a bunch of hoods and those two are equally more favorites.
The Bare gloves are true to size, but I don't really like them. They are hard to get on and the "scales" on the palms are slippery. I switched to Waterproof G1 3mm gloves and like them WAY better than the Bare gloves.