I don't know if you knew about it, but it was a huge debate about gold4rs here a few moths ago.
I have never traded with them, and I try keep neutral in the debate. From what I got, most people where happy with the service (this is abit guess, because it's more likely that there's people who are unhappy posting than the happy ones). Some posted valid proof that they where scamming. This is illegal when buying/selling for real money.
So I think you where lucky and had one of the many successful trades with gold4rs.