Overall very useful and well designed. Highly recommended.

Overall a very useful, well designed app. Works great for drilling intervals and chords. You *can* drill all intervals up to a 13th, all the church modes along with all kinds of other scales, and just about every possible (certainly every commonly used) chord.
Criticisms though:
-As other reviewers mentioned the quality of the piano sounds is absolutely terrible. I guess its cool that there are a few different sounds to pick from, (though I dont really see much use in them, really. I mean, who wants to use an electric bass sound to drill chords?) but Id gladly sacrifice those options in favor of good (or even just better) piano sounds. Theres really no excuse for this in this day and age when there are tons of great sounding sample based keyboard instruments out there to be had.
-The range selection really isnt of much use. Once you get very far to either extreme range-wise it gets a lot tougher to differentiate pitches. Especially with such lame sounds (not to harp on that point).
-The "Tempo" and "Pitch" sections seem pretty useless. How is guessing random notes and tempos going to help anything? Youd have to spend an eon doing that to develop perfect pitch. Some sort of rhythmic or melodic dictation would be much more useful.
-It would also be very useful to have a chord function/harmonic progression test of some sort, even a very basic one.
-It would be nice if you could set the level for each individual test.

Despite these minor (ha!) issues, this is really a great app and Ive been using it a lot. With a few improvements itll be indispensable.
Highly recommended.

Rockinrocker4457 about Better Ears - Ear Trainer