I know someone who has one of these as a lift for heavy crap like lathes etc. Works very well. But I wouldn't use it as a working bench for a motor. For less than that $$$ you can buy a purpose-built engine stand that you can use to turn the engine around..to work on top vs bottom. Or a milk crate, lift it with a mate and put it on a solid wooden bench.
It could also fall off that stand when u start brute force to lever off stuck bits.