Good but not great.

Its nice that you can export your tracks to your iPhone or iPad and then go in and adjust your beat grids and set cue points. Then with the CDJ-2000NSX2, XDJ-1000, or an XDJ-RX you can use your iOS devices just like you would a thumb drive. Those are currently the only Pioneer supported products you are likely to see at most clubs or events.

There is one thing this app is missing which if added I would update my review to 5 stars. The ability to transfer music to it from another IOS app like Dropbox or Google Drive. In those apps and many other Downloads apps they have the option to take a file and "Open In" another app. Rekordbox is not an option.

If my laptop dies on me the day of an event I could still download tracks on my iPhone and then transfer them over to the Rekordbox app and have all the great functionality of a Rekordbox prepared track. Ive already had multiple occasions where this functionality would have saved me 90 minutes from driving to a friends house and borrowing their laptop.

rediknight about rekordbox, v2.1.1