Here are some quotes from Business Insider's review of the iRig PRO:
"While I have a pretty solid recording setup at home, it requires a few extra steps between me and the music, which is why I invested in IK Multimedia's iRig Pro. It's a one-plug solution that works not only with my Mac, but my iPhone and iPad too, and can turn aimless noodling into a quick recording."
“The size of an extra-thick candy bar, the iRig Pro fits easily into a pants pocket…"
“You can record using any software you'd like…Most importantly, the sound was clean, and free of hum and distortion.”
“It’s ability to capture sound is very good, but ease of use and iOS compatibility are what puts this device over the top for me. If you've been looking for an easy way to record high-quality music on-the-go then, the iRig Pro may be the solution you've been looking for.”