I have an 2006 Enduro which is pretty much the same frame (and very similar fork now). The SX will be a bit heavier and shorter than the enduro but the rest will be pretty much the same. I find that there is very little pedal bob so it really isn't a bad climber at all...sure its no XC race rig on the uphills but it climbs fairly well. Decends really well and jumps well also.
Gastro has an SX which i believe is an 05 (could be the wrong year), you can drop him a PM or wait till he looks in on this thread.
PS if you do PM Gastro...careful...he bites.