I was not knocking the app itself or you using it on android, but directing my message toward the Apple generation who saw the post about an Android app and wishing it were available for the iPhone
Thanks to Apple marketing its all about buying new apps that do a small niche requirement but for something the user probably already has, and charging the user a small price so that they can tempt enough sales to cover the fees Apple have put onto the developers
Your app suits you, and its free
In my opinion you could have a lot of manuals easily with no app requirement
A missing manufacturer is less likely, but if missing you can download one yourself, and if its not available on PDF he wouldn't have been able to add it to the app on request so easily
I believe the app was written by a paintballer on the UK circuit for himself to be convenient and to meet his needs, releasing it to the public is just an added benefit. I'm certain when he first publicised it and was asked for an apple version that he said he would be willing to do so - provided those asking for it funded his apple development fees. Obviously when it was going to cost more serious money for something people had for free the £s were not forthcoming
One collection of manual PDF links:
http://www.ukscenario.com/forum/viewtopic.php?f=11&t=24390&p=417518&hilit=Manuals#p417518