Note, this is a review of the first generation GPX Pro, not the current GPX Pro4/8 units- however, much of this review should apply to both units.
Overall, I’m in love with the GPX Pro- it’s a great cost effective solution for capturing and analyzing data while you are driving or riding (all my tests were done on my SV650 race bike). The unit is easy to install, use and surprisingly easy to read, even in strong sunlight- probably due to it’s use of a grey-scale LCD display rather then a color display that is used on laptops and iPads. The software “GPX Studio”, is also easy to use and has tons of great information, but unfortunately Windows only (no plans on a OSX or Linux port, but it works great under VMWare/Parallels). I really learn a lot by looking at my brake markers and corner speed.