So far I've found the people at Braintree to be friendly and extremely helpful.
Also, if you don't see your business rising above the minimum monthly fee then it's probably not really worth your while. After your first 20 customers or so, you'll be paying exactly the same as most of the other gateways.
It isn't a matter of not rising past the minimum monthly fee--it is a matter of the burn rate while ramping up when you're bootstrapping. Shortening the runway is a bad thing.
If their sales person hadn't blown me off, I might have settled on them after looking around. As it was, I decided to hold off opening the account until we were farther down the road with development.
Just try searching for competitors in Twitter - you'll quickly get a indication on the type of customer support they provide: http://search.twitter.com/search?q=authorize.net
So far I've found the people at Braintree to be friendly and extremely helpful.
Also, if you don't see your business rising above the minimum monthly fee then it's probably not really worth your while. After your first 20 customers or so, you'll be paying exactly the same as most of the other gateways.