Dwolla doesn't charge that way because they're not billing credit cards. You give them your bank details and they do an ACH transfer with them, IIRC.
I've heard both good and bad about them, but they don't have large use yet.
I've heard both good and bad about them, but they don't have large use yet.
In so far as large use cases, they have some really good traction in the bitcoin market. I believe that they are the go to for transferring USD in and out of MT. Gox.