Built two QK65s and I find the included OwlStabs to be quite comparable to Durock V2s. The most notable difference I've found is that the rear gap on the stem is quite small, so "plugging the butt" can be a bit more difficult/messy.
They include small wire "rests" which are a novel idea, but do mind that too much padding (included PE foam layer, etc) WITH the wire rest can add too much upward pressure and friction to the wire, which slows down the key.