Simple
A small and easy application to visualize those bulky GPX or Garmin TCX files. GPS log files are intended for computers, not for humans. GPX Reader gives you a visual look at your GPS data, the way humans do.
Sharing
Share your files between OS X & your iOS device by saving and reading them fron Dropbox. And if you just bought the iOS version you can simple save them to iCloud and check out your files on all your devices!
GPX & Garmin TCX support
True, the application is called GPX Reader. True, it's built for GPX files. But, do you really want to convert your Garmin TCX files to GPX only to visualize them? That's why GPX Reader supports TCX files out of the box.
OS X & iOS
On a desktop? On the go? GPX Readers gives you the same visualization on both an OS X computer or an iOS device like your iPod, iPhone or iPad.
Example files
Looking for some sample GPX files to try out? Here are some of my runs, exported from RunKeeper.