I've tried three bitcoin exchanges now, namely Mt Gox, Trade Hill, and Bitcoin 7. I was successful with all three!
Briefly, here are my thoughts on them.
- Mt Gox - Trusthworthy, secure.
- Trade Hill - They are still perfecting their service, but their customer service is unmatched.
- Bitcoin7 - Quickest service in processing payments... but this may be because so few use it. Their site is also easy to navigate and understand.
More exchanges is a good thing for the bitcoin economy, even for the other exchanges. More exchanges means the bitcoin currency has greater liquidity, which will give investors a felling of confidence in the currency.