I looked at about ten used lifts, mostly on CL, one through a friend who had a friend...
Considered buying a HF lift, went down to buy it, and they had just stopped selling that model in the store. I saw a couple of those and they would have worked for me, but I'm glad I got the Rotary because of the way I use it. I expected to seldom have a vehicle in the air for a long time, but it didn't turn out that way. I use the low rise lifts for cleaning the vehicles as well as working on them, and sometimes I will have the rat rod in the air for days.
Buying a CL lift, there are some things to consider.
Everyone lies about the use the lift has had, well, almost everyone. Everyone who's lift I saw lied about the usage.
Some lifts do not like being left out in the weather. That does not stop people from leaving their lift out in the weather...
Now the good news for a lift buyer... Most are totally modular, so you are not risking disaster if you buy one and something is not right.
My Bendpak (which had more use than they claimed) needed a capacitor cover (five bucks at a local electrical shop) a switch cover (two bucks) and a good oil change. That one used Hydraulic oil, not ATF got the stuff at Walmart for 12 bucks a gallon.
You can replace, exchange, the ram on most lifts, the pump on any lift, the hose, which is something to be very careful off, at any hydraulic shop 40-60 bucks, and even parts of the lift.
I needed four medium steps and four pins for my Rotary, guy lost the medium steps. Didn't cost very much, you can buy parts on line.
Watch out for bent metal, especially on the ones where the parts can't be easily and cheaply replaced. I saw several bent lifts.
Getting one home, if you buy a low-mid rise, is fun.
The Bendpak is over 72 inches wide. Most trailers it almost fits... Four big guys lifted it in my trailer. My buddies and me had fun getting it out.
The Rotary and Mohawk can be disassembled and carried in a small trailer or even pickup bed.
Oh, and lifts depreciate pretty fast from new. Not that many people buying used lifts, and willing to take the trouble to move and set them up.
I know two poster lifts are often scrapped locally. Then they sell the pump on CL.