12V Gerbing T5 Gloves review:
First of all, the protection on these gloves is not on the highest level, although they are made out of leather, have finger joints protection, along with some light palm padding which doesn't seem like it's going to do much upon impact. Here is a pair of different 'winter' gloves I've purchased a few weeks back:
Alpinestar Apex Drystar Gloves
These have some knuckle protection which for me was too painful to handle. The protector doesn't seems to be precurved and is very rigid which results in moderate pain in the knuckles when your hand is bent. These gloves also do not work in temperatures below 40-45 Fahrenheit. My fingertips were freezing just minutes after getting on the bike and worsening as my half hour ride progressed.
Going back to T5's, the heating elements on these gloves are awesome. Rode in 35 deg weather with very light rain/snow and my hands kept warm the whole ride, even without the heat controller maxed.
On my right glove, the microwire isn't well woven in:
The black lines are the microwires woven into the fleece lining. That loop is also a microwire that at first I thought was the plastic tag holder and was ready to rip it out, but held myself back lol.
The waterproofing layer seems to be in between the leather exterior and the fleece/insulation lining:
It still has those 3 openings on each finger, but it seems like the waterproofing membrane is beneath it. I still haven't tested them in heavy rain, but it looks like I will have some trouble either way. The massive gauntlet of the glove doesn't seem to tuck in under my jacket's sleeve, unlike the Alpinestar gauntlet glove I've talked about above. So even if these gloves are waterproof, rainwater will still be pouring in through the top of the glove.
UPDATE: When I put on the glove first and then the jacket, the glove top fits under the sleeve, but is very tightly.
Some people also complained about the inside zipper:
It looks like it could be bothersome, but when I tucked the glove into my sleeve, it was unnoticeable(maybe the gauntlet folded in such a way that the zipper was not touching my wrist.)
Someone in this thread velcroed their controller to the bike which is a great idea and I'll probably be doing the same thing. Also, I might stitch some loops in my jacket for the V-cable which is just hanging off like a tail when I'm off the bike.
Overall, I like the gloves and they will sure make my winter rides more pleasant. If you have very sensitive hands then I highly suggest heated gloves.
PS I'll update when I have gone on a heavy rain ride with these gloves and if that doesn't happen, maybe gloves in a bucket of water test will be conducted

which will probably be unreliable anyway.
UPDATE
* Gloves are not waterproof. I've tested them in heavy rain and after half an hour ride, the inside was soaked. Waterproof overgloves are needed.
* Heating elements are amazing as my hands never get cold. Definitely worth even though they are not waterproof.