Definitely worth $15

For any theory student working to improve any sort of ear training - this is a challenging yet entertaining tool. Anyone hesatant to purchase should consider the fact that there are likely far less useful versions of this same basic idea for your computer that surely would not be much cheaper if at all - and thats not even taking into consideration the convenience of practicing intervals on the bus.

For the developer- only thing that really bothers me is the quality of the samples. A more natural sounding piano or a clearer instrument in general would be so helpful. sometimes

Dstack91 about Better Ears - Ear Trainer