Brilliant! Let your developers do what they do best: making kickass functionality accessible via APIs. Don't get them bogged down in implementing the billing, rate-limiting, and other restrictive (as opposed to creative) stuff.
Hi Xorlev - nothing is beyond improvement but we normally get excellent feedback from customers - and at very high volumes and performance! Having said that if you're having / issues problems then definitely contact us and we'd be happy to help.