Quote from: mel2000 on June 09, 2014, 12:54:48 AM

I'm still trying to understand any advantage this service has over Bitstamp or Coinbase.

Does this service allow clients to keep their assets in either BTC or $$ like Bitstamp?
Does the service allow selling BTC and holding the $$ proceeds in their Circle account, like Bitstamp?
Does the service allow selling BTC and depositing the $$ proceeds directly to one's bank account, like Coinbase?
Does the service allow one to sell their BTC for $$ without fees (not sure if Coinbase charges a fee upon selling)?

Circle's advantage is that you can sign up and instantly buy and sell without fees. No waiting like Coinbase, Circle assumes all of the risk.
Also all of your BTC are fully insured against hacking for free.

As for your questions:
-You keep your money in BTC.
-It is not an exchange, it is a wallet service / broker. Your funds are credited to your bank / credit card immediately.
-See above.
-Coinbase charges a fee, Circle does not (for now)