My only caveat would be that GTC for Mac is not identical to GTC for Windows. Each has pros and cons.

The #1 drawback to GTC for Mac, IMO, is that you can't see point data (e.g., at such and such point on the map, my elevation was 1234 feet, my speed was 18.5 mph, the grade of the hill was +4%). I use both, actually - GTC for Windows and SportTracks (Windows only) both run fine under Parallels.