FIREMIN I've been using Bobcat since it's fairly early unstable beta's. The last few versions haven't caused me a single crash. It's great to have a decent GPS mapping program for the Mac that's free. Garmin seem to be more actively supporting Mac software now (several updates in recent weeks) I did have to convert maps from a Windoze machine but that's mainly because I'm using a free Aussie mapset "Shonkymaps". Bobcat seems quite stable with it. I've had reasonable success moving data between Google Earth and Bobcat via GPSBabel+.
I have found that "Active Log" track files seem to keep speed information whereas saved logs don't which is a nuisance for some of the MTB riding I like to log.