I think the price could be a problem. I know lots of people who 'wanted to learn to play guitar', bought the equipment, and gave up within a month or two. They didn't really lose out as you can get a second hand guitar and amp for under $100. This is around $450 (not to mention the cost of the iPhone) - not really in the price range of someone who wants to learn guitar. You can get some nice 'real' guitars for that price.
