I have about six rides in so far this season, four with the BCA vest. I'm coming off of using a SnowPulse pack and trying my brothers Wary vest.
The BCA vest is the best fitting pack I've had. I was skeptical because it is a one size fits all, but once you snug it down, it is great. It does get hotter than a regular pack but that comes with the great fit and soft armor. It does stay cooler than the other vest I wore. I really like the fact that you can keep the beacon outside of your gear. I never liked having it at my chest level. You can also add a BC Link radio and hydration pack and have them integrate with the pack.
The bad things are simple and very easy to live with. My biggest complaint is that the front of the vest comes to a "v" and sometimes gets caught up on my mtn bar. Not enough of an issue to be concerned. Also, the storage is more limited than you might think. If you put too much in the pack it bulges into your back and doesn't ride good. But I can say that is good because I'm trying to reduce backpack load and keep as much as I can in the tunnel or dash bag. I just keep the shovel, probe and my zip lock of survival stuff (space blanket, lighters, TP, SPOT, etc) in the pack. The exterior shovel attachment is nice to keep the shove on the outside but it seemed like an afterthought. My particular shovel limits the pack storage even more when cinched down. I have to keep the handle in the pack or it smacks my helmet.
I'm being critical of the bad things because the pack is awesome! I recommend it based on the functionality, protection and price. Be a little cautious if you are a big person with a belly! You should try it on first.