Good, takes some getting used to...
Just to refute- some people say that you cannot test tritones, min6, etc. You can test any interval up to a maj13th. Under level select individual and pick any interval you want. Chords are the same. One review said you cant do dom7th chords... not true. You can test some very obscure chords.
Typographismo about
Better Ears - Ear Trainer