Its a pain in the arse (or foot). My first pair of boots last season fitted perfectly in the shop and perfect for 2 weeks then all of a sudden a constant pain in the ball of my left foot. Bought a 2nd pair and low n behold 2 weeks later the exact same problem that I stuck with.
I'll try and add a bit of support to see does that help this season but how am I expected to know if a boot fits when the problem doesnt surface for about 2 weeks of use!
It certainly is crazy that boots feel great at the shop and then as soon as you get them home and on your feet for more than half hour the pain cometh. Big money down the drain. With the K2's, I literally told the salesman that I would be wearing them for 45 minutes before purchase. Thats how I found the perfect pair.