I use BIAB on IPad extensively - every day and twice on Sunday's. I have well over 200 songs (mostly jazz standards) on it that I use as backing tracks for my daily use - playing melody and improvising on guitar. For Sunday solos in church,I use it for a bass line, with my own recorded guitar accompaniment (using the Record Audio feature), to back me up. I plan to use it for backup when I start playing in a public setting later this year.
I have had no trouble transferring the songs I have created on the desktop version to my IPad (after a few tips from PG when I went astray) but there are several items for improvement which I have recommended to PG (please see my two postings in the Other Programs Wishlist forum) - most notably the ability to go to the next song in a directory in one step. They have not yet made those improvements but I am hopeful.
Give it a try. It fits so well on a music stand - less noticeable than a laptop and larger than an IPhone.


Cheers! -Alastair