Audiogon's Express Checkout

How well has Audiogon's new Express Checkout system worked for you?
Good for me. Though my bank seems to have Agon on a short list of 'suspect' sites. I had to call them to okay the charge.
Thus far, it has worked well for one transaction and horribly for another.  I just sold a piece of gear this week and the Seller was charged three times on his card and I have yet to be credited.  Since this site provides virtually NO live customer service, you have to send an email and await a response.  

As far as I am concerned, I will never use Express Checkout again.