We were back and forth on how to best manage the subscription and delivery of this mixed service style productized service. Since we also offer hosting, we evaluated WHMCS and controlling our delivery via tickets.
While it had great server integration and automation, we thought it would be better suited to manage some of those aspects manually as most of our clients wouldn't order hosting without at least testing out our speed optimization service.
We use SPP.co with another business of ours and really enjoyed it and decided to go with them again. We are up and running in a little over a week and now to try to get the word out.