I know what you mean but I saw some bad reviews on the Play store and if I'm going to drop £15 on an application I am expecting something that is flawless. Not being able to try it out before ponying up is definitely a big reason for this thread.
Regardless, if RS is as good as you say it is I might just bite the bullet.
There is no way you are going to get flawless software for that type of cash. I have had the "pleasure" of working on a lot of software some in the multi-million range. Not a single thing I have seen in my entire career has been flawless.