I think this is THE essential app for aspiring jazz musicians. On the gig it is great to have the transpose feature. Chord names are easy to read, even on a phone except for the longest charts. Ive also used the desktop app a few times to create charts from scratch which I then easily emailed to other band mates as PDFs for those that dont use stuff like this or in the iReal format for the smarties that do. ;)
I use the app to practice melodies and solo ideas. I always push my students to use it, too.
The only downside with this app does not actually have anything to do with iReal Pro but is related to copyright law: the melodies of these tunes are protected under copyright law so the app cannot include the melodies. There are no notes, only chord names so you need another resource (sometimes illegal) to learn the melodies. This can sometimes be hard if someone wants to sit in, change the original key, but doesnt know how to come in at he head of the tune without a melody guide note. Thats why you gotta study tunes everyday!
All this to say that iReal Pro is an amazing resource for any student or professional in jazz. Easily 5 stars
Graham Spice about iReal Pro, v7.0.1