I just downloaded it on my iphone. It seems like a good tool, but that it would be hard for anyone to start using the app as opposed their laptop or simple paper and pencil. It looks like it takes too long to input simple information.
For example, it has a section to track spike marks. It would be useful, but to use it you have to enter Act, scene, spike color and notes every time. I find it easier just to have a piece of paper specifically for spike marks, and I then type it up later. I would hate to have to hold rehearsal or catch up later just because I couldn't enter the information quickly enough on my iphone.
You also can't send information from your computer to this app, so you would still need your computer and binder to access rehearsal reports, notes, etc. Same problem applies to the props list section, as it would have to be separately typed into the app. However, information can be sent from the app to someone's regular email. I guess that means this could be a useful tool during rehearsal assuming the information can be easily sent to one's computer after each rehearsal or performance.
The checklist section seems useful. I would love to eventually leave my clipboard behind and just use my phone to do a pre-show checklist. One would still have to type all of it up directly to their phone as there is no syncing function.
I like the show timer function. It looks like the regular timer that comes standard with the iphone and ipod touch, but it stores the information directly below the timer. You can label the times with Act, scene, or whatever you need to time. This would make performance reports easier, but not so much that most people would want to change their routines.
I need to use it more to decide if I like it or not. There is definitely some room for improvement. It costs $4.99 on the App Store, so it's a little expensive, but I recommend buying it just to see if it would make anything easier for your specific routine. I'm interested in seeing how people use this app.