I like it a lot!

I love this app. Ive been using it for three months and Ive had no issues.
Personally the coolest thing is you can edit the workouts in a text file and import them into your program very easily and quickly via email.

Past c25k and bridge to 8k? Transcribe your 1/2 marathon or full marathon training schedule to a text file and email it to yourself.
Click the attachment to automatically import it into the program and viola.

Gehan G. about Interval Run, v1.6.2