This is the first touch guitar interface that I have run into that actually sounds good and is playable. It has its own synth but also allows you to use an external synth via MIDI. The interface is uncluttered and easy to understand but also has a lot of depth to it. And the best thing is that it actually works reliably. This is a very high quality app. The developer has recently made all the in-app purchases free making it an amazing value as well.
wradcliffe about Guitarism - Pocket Guitar