Audio to Midi

I have the i2m - bought it from Sweetwater during the Black Friday sale. I use it with synth apps on my iPad and also with my Mac (using Reason).
Once you learn how to set it up properly to work with specific apps it works fine but can be glitchy at times. You also have to modify playing technique to minimize errors.
For $50 it was worth the experiment.
 
It does its job of decently converting a monophonic note to a midi signal but in no way compares to what an hexaphonic sensor or a truly midified bass can achieve.
You can't do chords, you have to play very cleanly with limited dynamics and notes will glitch from time to time.