I've had the J&S jack since 2006, and have lifted a 2006 SEUC, 2006 SEVROD, a Yamaha Stratoliner, and now a 2011 SERGU. I keep my bike on it 100% of the time when I'm not riding it. I've never strapped it down. I can roll my bike all over the garage with it, and keep the bike up on the 4th safety hole so it takes up the least amount of floor space. The only problem I had was when I first got it and the bottle jack leaked...they had a batch of bad jacks. I called, and they had me a new bottle jack in two days to my door...free shipping, and I did not have to send the old jack back. Great customer service.
The only "flaw", if you can call it that, is if you have an uneven floor, it will drag. But that is not a design flaw...they have to keep the design low to the floor in order to get the jack under the bike, especially bikes that are 1" lower than stock height. But if you have a relatively level floor, you can easily rotate the bike 360 degrees, roll it all over the basement/garage, all without worrying about stability. I wash my bike on it, and do all my service work on the jack...I even bought the oil change pan they make for the jack...works like a charm. I've even pulled both wheels off the bike when on the jack with no issues. It's no Table Lift, but it's the best thing next to that for those of us who don't have the space or money for the Table Lift. And I'm pretty sure it's all fabricated here in the USA, other than the bottle jack.