It's a great unit but couple of things to be aware of.
The irig clips into the sound hole of the instrument. It fitted my Martin but would not fit my Guild acoustic as the wood was to thick. The irig can't be adjusted for this.
I have also find that the iRig works best with the Amplitude acoustic app. It does not sound very good going into apple GarageBand. You can buy extras features to record in the amplitude app but I have found these to be expensive.
I have found using the AudioBus app to route the amplitude app into GarageBand to be the best way round this.
Apart from these 2 small issues I have found the irig to be well and the sound quality it records with the app is amazing for the price.