I find it tough to be too critical on this app. It works very well and can produce amazingly good quality recordings which can easily be transfered, shared, edited ( to some degree), etc.
It is certainly well worth the price tag. I have also used gigbaby extensively, this gives a lot more features and functionality, but is a little less elegant to use than the baby version (with exception of file transfer to pc which is a breeze with gigdaddy and can be a real pain on gigbaby).
Some minor gripes are... Cannot get Bluetooth headphones to work (even though no issue on baby). Metronome is a but cumbersome and tough to set up quickly. GUI is good. But a little too much squeezed into such small screen. I have used in live sessions and its easy to mis-hit record or play or mute and destroy or miss a track.
Support is great, coming from owner of iometics himself.
Overall this is an amazing app that can produce quite unbelievable results even with built in iPhone mic.
There is some room for further improvement which will make this a truly killer app.
Calnico about GigDaddy Multitrack Mixer