So that's nice, but the second to last comment says that speeds are much lower than for stock firmware. It could be that this person just didn't configure his node correctly or it could be that this is the case for all ubiquiti devices.
Lately we've been talking about the possibility of using non-openwrt routers for point to point bridged links. We've heard from a few people that performance of ubiquiti M5 gear for point to point links is basically the same in OpenWRT and stock firmware.
I think we should test that ourselves. I'm ordering some nanobridges and nanostations right now and we should do a few tests with point to point and point to multipoint using openwrt and stock firmware.