Quote Originally Posted by Deviant Idol
most venues I play at are pretty stable and I don't think they'd ever need to use them.
Stability isn't the issue... it's feedback.

If you play on a big rig then basstones can vibrate the room, which vibrates the deck, and the vibrations go back into the needles... and then it feeds back over and over.

Thankfully, the "rubber band round ashtray" solution at the club I play at has been replaced by some sprung deck legs, which work much better.