Charge Rabbit has been incredibly helpful with our subscription box business. I got it up and running myself in a day. Then they helped me with integration when I was sucking at it. They actually offered to help me with a more complete integration when I was asking questions to do it myself. It would have taken me a day to set up what they did us in 30 minutes.
Another great thing about Charge Rabbit is that they reach out any time they have a problem processing an order so that you can take action it. In our case it was primarily international orders since we don't ship internationally yet. This allowed me to reach out to those customers to find out if they had US shipping addresses - many did. Otherwise those would have been lost sales.
Finally, Charge Rabbit automatically reduces your rate your rate as you increase in volume. At some point I sent an email asking if our rate could be reduced, only to find out that Charge Rabbit had done it two weeks earlier.
I've also gotten email replies from them at 10pm - so I know they are truly dedicated to helping their clients.