I've got a Park bench mount. Got a deal off local Craigslist. It works great. Only thing I would change is t have it hang the bike farther out from the bench. Sometimes if the bike isn't perfectly straight, the pedal hits my bench when I'm adjusting gears, or whatever.
A heavy ballooner also tends to really stress the bench top, so be aware of how thick the material you're bolting it to is. I have no doubt the workbench top would give out before the work stand. LOL
Newer lightweight bikes, or Stingray-sized bikes are no problem though.