I just received my sport yesterday and will be checking it out this weekend. I have owned and used a scout for about five years. The scout is ok...but somewhat complicated to get used to (understanding the flashing lights) and does have its limitations. I sometimes had issues and frustrations with it (usually low battery or trying to get the magnet on/off to work) and could not use it. When it worked, it did function as designed and got me back to the anchor line more times than not. When it did not, it was usually due to very poor visibility and I swam right by the anchor. The majority of my diving is along the Massachusetts coastline and the visibility is usually not very good. For those of you who are bug hunters or scallop divers, you know what I mean when I say why bother with a compass. The scout, even with it's little hassles and complicated light system, did work for me and I have been pleased with it. For those who cannot afford the sport, the scout is not a bad tracking system to consider.
That said, I've decided to upgrade to the sport model. The ease of turning the units on,the low battery indicators, and the longer range made me decide to upgrade. It has not been in the water yet, but my first impression is how much larger and more robust the units are compared to the scout. I will post next week how the sport model worked in actual dive conditions.