I waited quite a while to buy a 305, as the Mac support software only came on stream earlier this year, and even then only as a beta version. Some Garmin software is fine with the Mac, but several areas have yet to become native across both Mac and PC platforms. This has been an ongoing issue for me, since my Garmin regularly loses tracking at around 17 miles (frustrating on marathons to say the least!) - a fault which I'm told by Garmin support can be rectified by downloading the unit upgrade from their website. Guess what? Yep, the download is available for PC systems only...
I'm guessing that many/most RW staff machines are Mac based (standard platform for much design and journalism...)? Are they finding a way around this issue?
Russ the frustrated MacRunner