What he said...and yeah, I run them all the time. The 4snows are
a little more baloony (is that a word?)...they expand about 40% at top
speed which is like having another gear that you don't even have to reach
for. The wedges expand also, but not as much as the 4snows. That is the advantage of the 4snows. However, the prowedge2's hook a little better and are heavier duty so they will last a little longer and handle rougher terrain. If I were going to ride some really rocky trails though, I'd throw on my razor2's.
Oh yeah, not sure about the 4snows, but everyone runs the wedges in
the opposite direction of what is indicated on the tire. Look at the pic of
mine and imagine the difference if the tire direction were reversed...thats
how they indicate to run them, but they hook even better in the opposite
direction like I have mine.