My dad has bought a GB-580p and i'm really surprised it is that good. But I think it needs a coupe improvements.
1. Increase the number of 200 points when you want to track a route. I think it needs to be at least 1000 points.
2. It is not possible to transfer .gpx routes with the program, maybe a bug? It really should support gpx files, it is in the program, but when I try to transfer them to the device, it comes with a unknown error.
3. Improve the program Gs-Sport Training Gym. It's a good program, but it sometimes doesn't do anything for a while, the only option is to shut the program down with ctrl-alt-del.
I think the first thing you want to see if you open GS-Sport Training Gym, is an overview about the activities you have. It is not really user-friendly that you have to search for a date when you want to see your last activities.
I think it should be made possible to share the ride with your friends with the program. Everyone wants to show what they've been up to. Make a kind of widget for facebook, or for websites, so that you can make it visible for other people. Programs like endomondo pro, sports tracker etc. (smartphone apps) make it possible to share your ride or run with other peope.
A MAC-friendly version of sport training gym pro would be great!
If some of these suggested features will be built in into the device, i want to buy one also!