I have a 2 post lift, a 12 year old 7500# Bendpak.
I can count on 2 hands the times I've wanted a 4 post instead. My next door neighbor has one, and the only time I use it is to set up ride height on coil over equipped cars.
For my first lift, if I was to choose one over the other I'd buy a 2 post.
You can do motor pulls and if you pay attention to setting your lift the car does not get unbalanced to the point of instability.
Rear end work and pulling motors is a big PITA with a 4 post, as the crossbeams and ramps are always in the way.
4 post lifts hog up a big piece of floor.
If you are worried about the anchors pulling out, brace the lift to the ceiling. That's what I did, and none of the anchors that are only in 6" of concrete are loose.
I would buy that used lift in a second. Looks like a good deal on a good brand to me.
my signature lines...not really directed at anyone in particular..
BE different....ACT normal.
No one is completely useless..They can always be used as a bad example