So, do all you big servers ever S&V? I once played a guy who had a HUGE serve. Not sure how fast, but the biggest I'd ever faced. I could only block it back, which worked, but was very defensive and weak. The thing is, he stayed at the baseline as waited for my floating return instead of coming in and putting it away. IMO he didn't capitalize on his weapon as the rest of his game was very average.
It seems to me that if you have a big serve at the 3.5/4.0 level, S&V would be a good strategy as many players will not be as offensive on the return.
Pro Kennex 7G, Head Rip Control 17 @ 58lbs, rubber band dampener, Tourna Grip.