I use the gpx import feature (not all the time though) and it works quite nicely for those of us not using the Forerunner series or, like me, not running under Windows so I can't use the little garmin applet for uploading. The only minor gotcha is that it currently only imports the first track if your gpx file contains multiple tracks, so you may need to massage your gpx file accordingly before uploading.
Ken's software does particularly nice maps & graphs - much nicer in my opinion that some of the other offerings out there, see PG's recent
Billygoat re-walk - mouse along the route and see all sorts of useful metrics (alt, hr, pace etc).