Depends on how complex your product and pricing model is. Zuora is slightly enterprisey customers and priced accordingly and they charge setup fee, customizatio

Depends on how complex your product and pricing model is. Zuora is slightly enterprisey customers and priced accordingly and they charge setup fee, customization fee etc., If you are looking for simpler products focused on small & medium businesses there are plenty of options available as well. Of course if you are in North America you have Stripe as your first bet and for bit more sophisticated billing plus more options to do promotions, automated notifications, HTML emails, customer support portal, more complex metered billing, grandfathering of price plans (happens!), multi-gateway support etc., you should consider using a billing solution. Disclosure: I am one a co-founder of http://www.ChargeBee.com http://www.ChargeBee.com, another Subscription Billing solution focused on small businesses. Shameless plug: If you are looking for options to use payment gateway for credit card + bank transfers for recurring to save $$s per transaction you should try our solution (launching the ACH part very soon).