I'm with you and I agree as to the effectiveness. I'd just like to see it one time against a real pro.
We used to play against a girl that would hit what we called the "puff serve". It would just barely clear the net and was impossible to return. You couldn't tell from her motion when she was gonna use it so it drove us crazy. If you hunched up she'd hit one hard (for her) and it was just hard enough to give you trouble.
Come to think of it, I down know if I ever won a match.
LOL..................... this is a great subject!!!!!
He was a good guy, we were highschool swimming teammates, and we used to be relatively similar in tennis ability. Every once in a while I'd drop one of those little under-handed serves over the net (usually when he was showing some wear and tear), and it used to send him into a rage.
LOL.
It got to be that he'd never invite me out to the club unless I promised not to use that serve again.
;-)