Both Netgear and Linksys also released a router based on that same chipset as the RT-AC87U, and gave up on fixing it months ago. Netgear simply released a V2 hardware revision, leaving V1 owners in the dust. Guess that's two more brands for you to avoid then...
Bottom line is, Quantenna are the ones responsible for this mess. Neither Asus, Netgear or Linksys can fix it - only Quantenna can. And so far, they've been failing pretty hard at fixing it, regardless of which manufacturer chose to use their lab-experiment-gone-wrong that the QSR1000 turned out to me.
If I were one of those manufacturers who released a product based on that chip, I would talk to my lawyers to consider what my options are.