Great little gadget
I haven't gotten my sensor to be super-precise yet, but it is so nice to get feedback while running. And to have all of your workouts saved to a website so you can review them later. Totally worth it for the price!

Miles Tracker
I love this product. I've used it in the snow of AK to the heat of Iraq and everywhere in between. The product is great just sometimes the IPod itself takes a holiday and I've lost some workouts because of it.

Works right out of the box
A friend of mine had one of these and I thought it was pretty nifty, so when he told me it was only 30 bucks (from 2 of the most overpriced brands on the planet, no less) I had to get one. I don't know how it works, but so far (after 7 runs) I have found it to be remarkably accurate. I have compared its results with Gmaps pedometer and with a measured mile on the road and it has been right on the money. It is easy to get started, requiring virtually no setup, and simple to use. I like being able to download my runs to keep track of my training, and if you know how far you want to run but don't feel like planning a route before you go, you can just keep track of your distance on the ipod and decide when to head back. It doesn't give you as much feedback as a GPS, but at a tenth the price it exceeds my expectations.

I have kudos for the Nike+ customer support, too. The first time I used the NIke+ipod, my Nano had not been synced in a long time and it had the wrong time and date, which were reflected on the run when I uploaded it. Unfortunately you can't edit your own runs on the website (which seems kind of stupid), but I emailed customer service and they fixed the problem for me in minutes.

Don't worry about getting the special Nike shoes, either. I'm using it with the Marware Sportsuit Sensor Case and have had no problem with the sensor being sensed.

DOESN'T WORK unless you actually run
The product description for this item should state explicitly that this tool is for RUNNING ONLY. Throughout the description, it talks about running a lot, but what it fails to tell you is that if you do any other sort of cardiovascular exercise, it will not work. I guess it needs the impact of your shoes on pavement in order to collect data. I purchased this because I wanted to track my workouts on the elliptical trainer and other machines at the gym, and when I used it during a very intense, sweat-producing, heart-pounding workout, it kindly informed me that I had gone 0.1 miles and hadn't burned any calories. Humph! I tried it a few other times thinking the first time was a fluke, but it produced the same results. I think it's misleading advertising for the manufacturer not to say that this product only works if you actually run and is completely useless otherwise.

Transform your Workout!
If I could give this product more than 5 stars, I would. I run outside a lot, but its awesome being able to keep tabs on the actual distance and performance of my workouts. You can sync your workouts (when you plug in your iPod to iTunes, you can set it to automatically transfer the data to Nike.com) so you can track all of your workouts and your progress. I was into running and training for runs this summer, but this completely changes my workouts! I love it!