Most of the time I am skeptical about things, which doesn't came along with the official software itself. The moment I saw this (Xenith) I know, I want it. It would be convenient for my personal needs. The design is clear and friendly. After installing it, I got even this feedback from my users - they love it, too! No issues so far (tested mobile, on tablets and pc). "yesss!" - this is my feeling about this marvelous piece of work right now.
Update: I purchased a branding free version. Didn't know, how to remove, so I contact Mike and all I can say is, support is super friendly and fast, too. Go on this way, Mike!