I hadn't used RoadTrip since it first came out, and it was terrible back then. So I updated to the newest version. Ugh, it is still terrible - especially with my map that pushes Garmin's limits in terms of detail.
It works, but performance is so poor as to be an exercise in frustration. I tried side by side on my Mac (2.4 ghz Intel Core2 Duo) and PC (2.8 ghz Intel Core2 Duo running Vista 64). I set detail to max on both, viewing the same area at .3 mi zoom on both. The difference was unbelievable. Using the arrow keys to scroll both maps, it flew past quickly on the PC and struggled to just crawl on the Mac. The speed difference was something like 10x on the PC. And this PC has the integrated Intel graphics, which rates as pretty mediocre in video performance for games and such. The Mac has the GeForce 8600M GT graphics card.
It's great that Garmin is finally supporting the Mac, but this is pretty lame. I don't know how they write their software, but it clearly isn't taking advantage of the full power of MacOSX. I mean, come on, this isn't something like photo realistic 3d modeling that needs lots of horsepower.
I also tried the beta version of Mac Basecamp. That's a real mixed bag in terms of user interface. In 2d mode, with max detail at the same zoom level, it is much faster.... BUT, none of the line features on my map are displayed! The custom types are working properly for polygons, but there are no lines at all. No roads. No contours. Zooming in farther doesn't make any difference.
I think it's really still a PC game when it comes to Garmin...