Thank you INAN. It is not possible for me to try the boots or any boots as I live in Hong Kong. SB boots are almost non-existent. The only way for me to buy a pair is to order from web.
From the very few comments I read on the web, more than one time people complained that the lace portion nearest to the toes is very difficult to be tightened up. Someone even broke the front pair of lugs of plastic wrapper in doing so. Do you find this is the case? How is the heel holding capability? I and wearing a pair of Burton Driver X size 9 and found it is a tad too large. I have small heels. Heel-lifting is constantly bugging me.
Makes sense. Order from backcountry, their return policy is amazing.
AS I previously mentioned, they fit relatively true to size. I wear size 12 shoes and wear a size 12 prime. I should probably be wearing an 11.5 prime, but I use fairly large orthotics that take up a good amount of space. It can be difficult to tighten up, but I personally like the "powerwrap". It allows your toes to have a little bit more room by not keeping the toe box as tight. Heel hold is phenomenal. In the strange case that they don't hold your heels in place out of the box, stick the included jbars onto the liner and get them heat molded.
Also, I highly recommend pairing them up with a pair of Sole Ed Veisturs. Thirty Two's have decent footbeds, but they lack arch support and a deep heel cup.
Overall, the prime is a great boot. It's supportive, comfortable, and responsive.