No experience with that line, but I can say that I used to use a pair of Mountain Hardware Exposure II bibs for riding. They worked great for keeping me dry, but they weren't really cut to accommodate the movements of riding. I would expect the Burton bibs to be better cut cor the movements of snowboarding.
AK is good stuff. 3 Layer Goretex cant be beat. The only neg is the price... you wont even think about that tho once you're wearing them. I own 2 pr of AK 3L Goretex pants and have owned a 3 of their jackets in the past: Some of the best 'Snowboard related clothing' U can get.
Only problem I have with the pants is no mesh in the vents, but my arcteryx is the same way. I still open them about an inch and don’t really get much if any snow in when riding. Also I don’t know how tall you are but for some reason they run kind of short, and I am 6 foot and a XL has a 33 inseam just big enough for me.