RegOnline is being used by my graduate department within a university to manage registrations and payments for a single event we hold annually, with about 110 registrants who must utilize RegOnline. The primary business problem that we encountered PRIOR to our use of RegOnline was our inability to accept credit card payments. We used to provide a simple registration form through our event's page, and then I'd have to manually send out an email to registrants explaining the payment options: Payment by check, wire transfer, or money order.
RegOnline was very helpful by solving our main need: providing a credit card option to registrants, and the ability to send us the account funds monthly by check to deposit in our university account. The main bonus was the ease in refunding occasional participants! Prior to this I had to do a cumbersome Non-Employee Reimbursement to refund participants who needed to cancel, but now I'm able to simply click a few buttons to refund electronically (as long as funds are in our account). It's been so helpful!