They are a fairly dependable place for information. I wouldnt recommend working for them though. The amount of work you have to do to earn $1 is ridiculous. But overall I would ask them for any definitions or questions I had!
I shop with Amazon quite frequently and the only negative I have found is that buying large quantities of G2's and Xyience are way over priced. Overall, they pretty much offer everything and I love the comparisons to other shops and items!