Does what it says but not a good use of iPhone
There is a great deal of info here for the serious player and it IS very handy.
Problem is the interface and the sounds. There are no scrolling by thumb lists. You have to press arrow keys one "page" at a time. You should be able to "slide" the page to the next function. Instead you close one page to open another.
Worst part us that to hear a chord it opens quick time and plays a (wav?) file. Very slow and cheesy. Just play a midi file!
Does it give you info that no other iPhone app does? Yes. Is it Iphone user friendly? No. Not by a long shot.
rduval about
Guitarist's Reference