I'm a recent audio fuel convert. I am really enjoying seeing the benefit from the pyramid training session track. There is no way I could push myself to run that fast when running and so for me, it keeps me on track. As suggested before, try the free download.
I agree Southdownsman, my garmin was set for 13.1 and my time at the 13.1 mark point was about a min and a half faster than my chip time! I am going with my garmin, if it's that much out then how can we ever trust our garmins again!!!!! I think races are often out, the 5k race for life last year was under 5k, I wasn't very popular pointing it out to my friends who all thought they had record breaking times! )