I have made around 500 transactions on E bay, probably as many buying as selling. I have bought a lot of tools and carpet cleaning equipment (second hand) and have as yet not had a major problem.
I would recommend it if you know what your after and are prepared to wait for a good example before jumping in, and also know the value of the item you are buying and don't exceed it.
Obviously good feedback from the seller is a must.
Be patient, understand how E bay works and there are some real bargains to be had out there.
Daren