My experience was the opposite (or at least: not worse than the stock firmware, or than most routers running OpenWRT), but there are a lot of confounding variables that'd affect that difference in experience - namely, a silent hardware revision that broke things for awhile.
I don't know if I'm lucky with the hardware revision, but I've had exactly zero problems with mine. I don't think I've ever even seen the stock firmware or at least not for anything other than installing "mainline" openwrt immediately. Has been running since, with steady updates.
