I'd have to agree.
I've used a strat with a noise gate before, and well, it killed my sustain.
It's fine for just jamming rhythms, but if you're playing lead on a strat, and then you get to that high note bend that you like to let burn, then suddenly it gets it's head chopped off...
If you just play rhythm, it's fine. But for leads, I'd stay away from it and just get a single coil-sized 'bucker.