I like that you have so many different types of tests which are very helpful when creating new APIs or if there's something wrong with your current one, it makes finding out what exactly went awry much easier than trying to figure this stuff all by yourself! It would be great though (and has been mentioned before) maybe adding some more test cases/endpoints? Maybe even add support for additional languages such as C# too since their integration seems pretty limited atm - but hey they're probably working hard behind closed doors haha :).
This software solves most problems around debugging existing ones because its easy enough to use without any prior knowledge required whatsoever- no need to go through tutorials etc.. Its perfect in my opinion especially considering how cheap compared to other competitors products available currently.- So far nothing really bad about using reQBIN either :).