one of my main concerns on the used ones were being wore out and needing expensive repairs.
If you jump on facebook there are plenty for sale but first have to decide your budget. Pretty much any rim clamp under a grand will need some kind of repair. Even though most anything you buy used will be worn but if you don't change tires every day should last you a long time, I got lucky when I stumbled onto this Hunter machine and the guy only wanted $650 for it. I made him dismount and remount a tire then handed him the cash. Only had it a couple months and has worked great so far.
