What does Authorize.Net do well? We have been using Authorize.net for over a decade now. Reliable virtual gateway to process payments. Good search and reporting available. Allows to process ACH payments as well. Once your gateway is set up and linked to your merchant account, there isn't much left to do.
What does Authorize.Net not do well? Some feature of ACH processing could have been improved. For example, the report of returns is only accessible online, but not available for API check.
What do you wish you had known about Authorize.Net before using? None.
Have you used a competitor to Authorize.Net? If so, how does it compare? No.