The idea is really great. And that I can connect my bass / my guitar with my iPod is indeed super. The problem is that I pay already 30 and then still have to buy the app, which I think is extremely practical because the free version is permanently distorted and so I can not do anything. I bought (a great Slash fan) the Slash Signature app that has but does not work at. Even after days of writing the English language support did not resolve the problem. Since you can then buy the VOX AmPlug that works and is at least of a brand in which you can be sure that everything works and is even cheaper in the end.
Conclusion: I was initially very happy that I could use iRig, because it makes nunmal mobile. But the thing with being too expensive app is clearly a downside, and that the app does not work for me the complete knockout. But the idea I like, and that has to be recognized, therefore me 2 stars.