I have the Pitbull with the 12-ton air operated jack. The thing is super solid with the bike up in the air (max lift height 25") and I put my SERG up without tie-downs and it is fine. With a small air compressor, the lift "picks: the bike up off the stand, raised it and lowers it back on the stand with no problem. The only thing I have a problem with is that I have to pull the SERG up straight to get the pitbull under it (this is not a problem with my stock Fatboy). The casters are easy to roll around the garage and when you put down the stops (after the bike is raised) it stays put. They very recently began offering a turn table option ($150) that allows the bike to be turned 360 degrees which I am interested in and can be retrofitted to my pitbull, but as much as think this lift is solid, I'd tie mine down.
Price-wise, I snagged my Pitbull on EBAY for about $280, the guy had gotten it as a gift and only used it once and wanted it out of his garage. I think they run about $600 retail. You can check them out at
www.pitbullmotorcyclelifts.com or call 888-299-9325.
I must say however that the Bestway lift looks sweet.
BlueSEI2