A warning.
Not as in "they sound bad"; they're quite a nice sounding box matched with the proper QSC powermap. Listening to some NIN remixes on them sounds like a bigass decent stereo!
(It doesn't hurt to have proper audionrrds setting this shit up... My god, I think sooooo many club PAs would actually sound pretty damn good if they weren't manned by the developmentally disabled! 
)...but they are fragile and we've blown one, and then blown the replacement. Apparently it's a serious weak point in the design.