I have the V2 Route 66, which has the same overdrive, and an early '80s TS9 (not TS808) - but I haven't compared them I'm afraid. Maybe martinw will chip in, he said on a thread the other day that he compared the J&H overdrive with a number of other Tube Screamer clones, and it was the best of them.
As for the noise gate, from reviews I've read (on HC, admittedly), it seems that it works well but most people turn it off (or down to the minimum level).