Full version unlocks access to:
1. 280,000 Pro/interactive tabs
2. Tab Tools (air printing, emailing tabs)
3. Guitar Tools (tuners, metronome, chord library)
Please note that Basic access allows you to view 1 mln tabs and gives offline access to favorites.
It's always up to you whether to upgrade to the Full version or not.
This ad appears only 3 times (if you're not trying to use any feature that is not included to the basic version).
You can close this ad by pressing "back".
Also, you can see the ad for Tab Tracker in-app that is not included to Full Version upgrade and needs to be purchased separately.
You can read more about this in-app here: (link)
Tab Tracker ad may appear only once when you start the app.