I picked up a QuNexus, and the playing response is actually not bad. It's a little bit more cramped than I wanted, but it does have other uses, plus it's really small and light and USB powered. I was so happy with it, I bought a QuNeo, which is partially designed (its 4 x 4 array) for finger drumming, but it's much less sensitive than the QuNexus so that you can't tap it to play, rather, you have to whack it. It will suit some people, but it's useless to me as a drum controller, although I can use it for other things.
I love my QuNexus.
Funny you mention the sensitivity issues on the QuNeo. I had the same issues with how responsive parts of it were (the sliders, in particular, were really dull, and the buttons really needed bearing down to activate) but the pads themselves were quite tappable. I ended up exchanging it for the Nexus and a Launchpad Mini.
Neat devices, but it seems KMI doesn't have the consistency I'd hope for from a professional instrument manufacturer.