I upgraded my Archer C7 (v2) to use OpenWRT, and while I've overall been much happier with management and features over the stock TP-Link firmware (I finally can have IPV6 now), throughput has issues.
I have been using the classic WRT54GL running dd-wrt for a long time now. It's been rock solid, but recently the wireless has stopped working, so I'll have to finally retire it sooner or later for ...