The app is nice. It's a very stripped down Amplitube but has all the potential of the full version. It's just a matter of purchasing the modules. The ...
Agreed, I can't play lead and sing at the same time and most that do its more rhythm and some sound candy added in every once in a while.
Ya for 1oo there are a few great options: CAD M179, MXL V67G, MXL 2003a, Shure SM57/58, Audix i5 or the EV 635a. :)
We have tons of reviews listed on our sites with actual audio examples posted as well. :)