Its honestly a round-about way to use dwolla to fund the account. You end up paying alot more in fees. MT. Gox still accepts Dwolla directly, and it still only costs a flat rate of $.25 to fund my Mt. Gox account.
Sorry guys, but I dont think I will be using Bitinstant as a third party. It just adds to many hands into the mix of trying to get money into my exchange. IF theres anything we have learned from bitcoin, is that you should take all start-ups with a grain of salt, especially when it comes to ACH.