First off, this is an expensive product but don't think this will be your last & final purchase relating to it. The IK iRig thunderbolt connector cable snapped very easily, well that's 50€ extra. No IK iRig power-supply is provided, they use a non-standard 5V adapter, that costs 50€ extra also. Basically doesn't work on Android, which is OK, I use my old iPhone instead.
Record quality seems OK, indicators are non-descriptive and if the battery starts running out, the device just turns on and off incrementally.
Install the iOS App, well you gotta pay for add-ons.
USB powered? Nope, not if you use a mobile device.
They provide 2 AA batteries, because they want to up sell you on their proprietary power adapter. The batteries drain *very* fast.
Basically a half arsed product and they attempt to milk every penny out of you. I wouldn't buy this a product from this ever company again.
Avoid.