I have the v1, and its only real restriction is down to the broadcom 4 series cpu which restricts its bandwidth to 2MB/s. That is a bottleneck.
But - i still manage to record tv programs from my tv box to its attached USB drive and download and run other tasks with minimal glitches!
The v2 has a better CPU. But you want to check it doesn't have any restrictions which would prevent you running openWRT on it, to do this use the hardware list featured on OpenWrt.org