Ouch! One of the reasons I'm planning on a two post MaxJax
Mine has performed flawlessly. There is some slight leakage from the hydraulic cylinders, but that barely wets the base plate and I haven't bothered to wipe it up after over a year of use.
It only has two raised position locks. You put a bar through the column and lower the arms back down to rest on the stops. It works fine but I've been considering drilling a new hole or two. When putting in my Boxster transmission, the lift was below it's first stop and was sitting on the hydraulics. It was low enough I could use jack stands under the arms as a safety measure.
At the top position, the bottom of a car is high enough I can sit on my Harbor Freight furniture dolly with a generous foam pad and roll around with a few inches of head clearance. That makes things underneath much easier.
I got mine through Costco, they carry them occasionally. It was a good deal.
Ian