Yeah. OnSong is nice alright. I bought a new copy for my iPad, and less than a week later, I got annoying pop-ups everytime I open it that says I have to upgrade to a new version. There is no free upgrade and the Apple Store want's $8.99 for the upgrade on a program I just bought. Now, my OnSong refuses to open unless I upgrade. Not for me, thank you. This is one big rip-off.
It's not even that great of a program. It takes forever to get your lyrics and songs intro the program because it is not compatible with any PC programs like my beloved Digital Fake Book on my laptop. Now that's a great program. Unfortunately, they do not make it for iPad. Editing is a nightmare, and half the time, when you try to get your songs from the internet, all you get is gibberish. Again, save your money. OnSong is a big rip-off.
In fact, I think the iPad is something of a rip-off as well, at least from a pro musician point of view. The iTunes player has few features compared to great players like AIMP3 and the Spider Player. It won't stop after each song, requiring you to manually stop it at the end, and it does not allow fading from one song to another. This is a pain when you have your hands full of guitar on stage. It has no Normalization function, and no pre-amp. I've gone back to using my lap top for stage work. iPads seem like just an expensive toy, and unsuited for any real work. Heck, they cost as much as a Laptop, and only do about 1/10th as much.
I may give an Android Tablet a try one of these days, but for now, if you need a good stage tool, get a Windows Laptop, the free AIMP3 Player, and the free Digital FakeBook, and you'll be set for life. And in case your wondering, Mixcraft kicks Garageband's butt all over the place. It does about 100 times more things, and is a pro-musician program, but very easy and intuitive to use. I score radio and TV spots with it all the time. Garageband is just a toy.
Take a look at OnSong. Very Nice.