i have a d300 and use the commander mode to trigger 2 sb-600's pretty frequently. overall i'm satisfied with it's performance, but at night or dusk (times which i shoot at quite often) the flashes only fire like 60% of the time. would getting the su-800 help this at all? i've heard mixed reviews about it, and i don't think that $249.99 is a bad price for it. i usually shoot my friends skating among various other things so it is annoying when my flashes don't go off. i'm never more than say 10-15 feet away from my flashes either. so would buying one of these solve my problems?