I haven't used, it but checking on the forumotion forum that only admin can see it is approved by ( in fact designed by I think) Forumotion themselves and is intended for mobile users if I read it right.
The app is described as a beta version ie still in development and some moderators from other forums are reporting that some members are having problems with navigating their forum when using it, other mods report the layout of their forum looking messed up when using it.
I suspect a lot about how well it works might be to do with which device / operating system you use it with and how fast any bugs get ironed out.
Seems to be no reason why shouldn't give it a go though.
I'm sure we'd be interested to hear from anyone trying it out.