I'm not sure on snobuilder, but my problems are do to my abuse of improper lifting, and being hit, and run down by a Cadillac while in a pedestrian crosswalk.
MY wife found me a Teeter at a garage sale, brand new, used once for $75. I use it and have gotten great results from it. Take the time to set it up right. You should be bale to get on/in it standing and then by putting your arms over your head, it should slowly invert you. You should go back upright by then putting your arms back onto your belly. Set the stop strap too. There's no reason you have to go fully inverted. I use mine at about 50*. Works great!