Independent flashgun for G3

[robh]

I am wanting to get a flash gun for my G3 and am considering what to buy. Would like it to be able to use automatic facilities of the camera.

Has anyone tried any of the independent makers flashes on a G3. My local camera shop says only the Canon ones will work properly?? I don't know why.

I know from previous experience on EOS camers most independents work fine.

I would be grateful for any help.

...robh