Follow up
Ended up with Gears Canada heated jacket liner and gloves. Didn't plan on the gloves, but figured if I'm ordering stuff, why not.
Jacket liner is amazing. All day heat. I hate RR grades, long/straight/boring/cold but this jacket liner makes it feel like sitting in the easy chair with the wood stove crackling. Entire jacket is heated, not just a spot here or there like so many of the other brands I've used. Even the collar is heated and wow, did I not expect that to be of interest, but it really cuts that cold bite on those long open sections where the balaclava just moved enough to open up a smidge at the back of your neck.
I do long trail rides, usually 10+ hours with minimum breaks. Getting cold once dark hit was just a fact, especially lower back. This solved the issue entirely.
I only have about 50 hours of use on the gear, but very happy so far.
One day took off on 6" of fresh with snow coming down all day, when I hit the furtherest point, it was 18" of fresh. It just covered me and the sled as we were breaking trail most of the day. Without the heated gear I would have been done, snow had soaked through the upper layer on the bibs, coat was holding it's own. You could see the steam rising off the gloves while all the bars and rest were just a big ball of ice/snow. Had to stop at times to break it up so brakes and throttle would keep working (fun for some, but not fun for big mile days). Jacket definitely kept me going that day. Was so "bad" that I had to plug my heated shield in as the snow dust was blowing up inside my helmet and icing up the inside of the shield (normally never a concern with this BRP mod 3 helmet).
This jacket liner:
http://www.gearscanada.com/heated-clothing/gen-x-3-men-s-warm-tek-heated-jacket-liner.html
These gloves:
http://www.gearscanada.com/heated-clothing/gen-x-3-warm-tek-heated-gloves.html
Note prices are in CA, so less than what is listed. Still not cheap.
Jacket liner fits as their chart lists. It's stretchy by design to help fit snug and give the best heating effect. I went with the size I expected to need (XXXL); could have probably gone for the next bigger so the back would have been another inch or two longer. Not sure if it would be overall too big on the next size or not.
Happy with the fit, could be even happier if it were just that teeny bit longer to keep my back well heated when hunched over. This liner replaced 1-2 layers I'd normally have on.
Gloves put out great heat. I found the fit to be a bit off and the way they fit made my grip not as comfortable as I'm used to, which made my hands tired once I'd hit the 200 mark. Not sure if they'll break in more or if it's just how these ones are designed. Depending on brand, I usually wear a XXL glove. According to their chart, an XL should have been on the bigger size, but they way these fit, my thumb overfills the thumb spot but my fingers only reach 3/4 of the finger spots, so it was too big and too small at the same time (kind of weird). Fitment isn't an issue with other brands of gloves, so I'm blaming the gloves.
I may end up trying their heated glove liners, they look like they'd work in my regular cold weather gloves and I'm generally happy with my current (non-heated) gloves fit/comfort.
I ran another power tap off the battery with an SAE plug for this gear. It could have plugged into the existing outlets (ie heated shield), but I wanted a separate tap for these in case I also needed to run the shield. The controller box for the gloves and jacket liner is a bit bulky as are the cables it connects with. I attached it to my coat on the side and it worked well, but took some fiddling to get it reasonably secure and still have to deal with passing cables through a couple layers of gear to reach the controller..
Jacket liner does have pass-through cabling for the gloves, which was convenient for connections. Still end up with a wad of cables between the jacket sleeve end and the glove that you have to tuck in somewhere. Kind of a toss up between durable and robust connectors vs something not so bulky. Gloves are not at all dexterous and are very stiff when cold, so tucking cables/etc with these on takes some patience and practice.