We have been using this for 2 years now with very good results, they are proactive in every sense of solving problems before it arises as well keeping us updated about new features being developed through their forums - which we heavily rely upon! Some things that would be nice include better pricing plans & more granular quotas (i want my daily usage limits set per hour rather than month). But so far I don't think anything has come up from them yet or maybe i'm just unaware? Great system overall though especially when your quota starts getting low you're notified pretty much immediately instead if having someone else contact me first :D It's very easy to use, it has some nice features that are not available elsewhere. The support team was helpful in getting me set up with quota guard for our organization. I haven't found any downsides as of yet but I'm sure there must be something out there. If you have an application using API calls then this product will help reduce your billings by limiting how much data can be used per month.