Just got this and I see it will help me train me ear. Notice some errors already that could confuse students. The American T in word "celebrity" is transcribed as /t/, which is the British pronunciation, but the American should be / d/ . Also /l/ is said "/la/ " in the audio but it should be /l/ with no vowel sound. I will keep checking it out before giving it an overall rating. iTunes makes me rate it so I will give it a medium for now.
P Teach about Sounds: The Pronunciation App