I have used a Traqmate for the last 2 seasons and have found it very useful to analyze my own performance, even if not comparing it to others. The same could be said for any of the units mentioned. Was I faster in a certain turn by braking later and harder or scrubbing speed more gradually? Or was a faster or slower day to day, and in which segments am I gaining or losing. By merging it with video, you can take a look at a certain line. Traqmate has predictive lap timing which is nice for qualifying - you can see if you're already off your prior pace you can make a decision on what to do with the rest of the lap. One thing I don't like about TM is that it costs an extra $200 for a Traqdata which allows you 4 analog, 2 digital and one rpm input. It's adequate but not thorough if you want throttle, brake pressure, steering, and then add a couple of gauges. It's a good unit, easy to use and they are always upgrading the software. Any of these units mentioned will do what a TM does, so if it comes down to a decision I agree with the other comments go with the one used mostly in your class or region. I'm a huge fan of using data to improve driving technique. Hope that helps.