Stripe is super convenient for invoicing, and avoiding the headaches of POs and vendor management systems in favor of corp credit cards is totally worth it, but if you're used to ACH direct deposits or checks... man the tx fee feels painful. On a 10k invoice, fees are $290.3 
No I haven't looked at their pricing structure. But I don't think they have the extensive integrations with lots of online services Stripe does. Most services I use, Paypal and Stripe are the only options.