My experience on Audiogon has largely been to purchase gear. I have been pleased with every item that I have purchased on Audiogon, and happy with the price I paid for it.
And, the forums have been very helpful on technical information that I would not otherwise have easy access to.
Look for the bad and you will find that here, as you will anywhere else. But, when it comes to high quality audio gear, I still think Audiogon is the place to go.