I just received this device as a Christmas present...I was excited as I am six months into running and wanted to take the workout to the next level. The issue with the app seems to be that it will not sync the assessment workout, thus I cannot get my workout zones, rendering the need for the device useless as it will not perform any of the analysis as described in the advertisement. This same issue is mirrored by many on the micoach.com website forum, alas no fix yet by adidas. I would recommend Apple not continue to sell the product until the issue is resolved.
Positives: it looks cool and was easy to connect the monitor to my iphone 5.
I have been using this running system Since Jan of this year. Works like a charm. iPhone 4s, IOS always upd8. I was concerned with starting to run as I was a smoker. The assessment workout is ingenious. It measures your heart-rate at different levels of strain. All other goal oriented workouts that you download are are oriented towards the assessment workout. I can run 8KM without stopping now. AMAZING!!!!! 4.5 Stars-->speedcell still needs the dongle :-/