Just what I needed to update the functionality of my Suunto T3D. Gives speed and distance measurements in a variety of ways - inluding current speed in miles per hour (or kilometers per hour for you metric system fans) and current pace in minutes per mile (or minutes per km). You can only show one or the other (speed or pace) at a time, but being able to see my current pace per mile will help greatly with my training efforts for upcoming races. I also like that with one of the views on my watch I can see my heart rate, elapsed distance in miles, and current pace per mile all on the same screen.
Out of the box, the calibration was a bit off (I ran a 1 mile test, and it said 1.06) - but after calibrating it, it has been spot on for me. Calibration isn't really mentioned in the foot pod manual that comes with it, and the instructions on how to do it aren't provided either - you need to go back to the manual that comes with your watch for that info, as each Suunto does it slightly differently. And from what I have seen elsewhere, there may be certain Suunto watches you can't calibrate a pod with so you are stuck with out of the box calibration. I have the T3D and can confirm that this watch can be calibrated - for the rest - do a little googling and find out if it will work for you.
The unit itself is tiny, and I don't even notice it's there. The 2 piece design snaps around your shoelaces without having to unlace your shoes - and it snaps together pretty snugly. I personally am not worried that it will come flying apart as I run, which was one concern I had going into it. This design works great for me, as I have different shoes for trail runs and street runs and in seconds I can swap it from one pair to the other depending on the terrain I am taking on that day.
