Ahh yes, it is a clever app and I have tried to "demo" (free) which only lets you do simple transport and it does it quite well...but you cannot arm/record/etc in the free version.
I have never paid $50.00 for ANY ipad app and I have some heavy duty cad and electronics programs, let alone all the office stuff.
Besides there's absum-8, AC-7 and a host of apps that allow you to remotely control your desktop at a much less cost for entrance price.
I do not begrudge the makers of this app getting a profit, I'm sure the market base is rather slim since most muso's are continuously broke anyway...its just not worth the entrance price for to get a few more bells and whistles that I already don't use.
The iPad is great for tracking especially from another room, but its kind of an expensive transport device as a stand-alone and while this program I am sure is the cats meow...at some point everything reverts back to a tactile unit and thats where the money probably needs to go...especially considering "code"...