The price for the plan we selected was very affordable, since it included everything we needed. The support team is also great at their work, responding quickly to our questions and solving problems. I personally had no complaints about InstEngine as such, though I would like to see more options in the future for different languages, but this may be an issue with other services as well. We used InstEngine for creating a mobile app using the Facebook API, allowing us to create a fully functional application within a few hours of purchasing the service.