I've been waiting for a way to attach arbitrary screw-down accessories since I got my Proslat wall system installed last year - and this thing delivers! This is very nearly a home run in my opinion; the new spring-loaded way of locking the panel to the wall rather than the old screw-down system is awesome, it's not too small but not too big (allowing for just about anything to be fastened that you'd want to add - presumably they sized this for a 400x400 VESA mount's hole spacing to fit comfortably, but that covers a lot of other things, too).
Like all other Proslat stuff, it might seem wildly overpriced for a few bits of sheet metal bent on a brake, but the fit and finish here is much better than on the OG Proslat stuff. I love the matte textured powder coating and wish all the OG Proslat stuff used it, too, rather than gloss. Likewise, no tack welds here to fail, be misplaced, or look ugly. I look forward to mounting a Milwaukee battery charger on this (and buying up all the rest of them I can get my hands on for other things).
WARNING: