I have bought a heap of stuff through the classifieds, and must admit that the dealings have been very positive all round. Sellers here are honest, knowledgeable and very easy to deal with.
A few that I have had regular dealings with:
Davela, lot of things, always terrific!
Jon Goodman, great posts and honest descriptions
Alexandre Costa, honest and very fast delivery,
Kdemas...ditto,
Karl K, always has interesting stuff,
Jon Shui,
BJ Smith 7474,
Anton Lukoszevieze,
and I'm sure there are others over the years....sure beats the hell out of Fleabay but doesn't help the GAS