I've used a Garmin GPSMap60csx for years and love it. On our annual 600+ summer WI ride I plot the routes onto the device in advance. Spectacular. Every turn is preceded by a beep in case I'm not paying attention. There are a lot of "little details" that you just need to figure out in order to tweak your ideal experience, but I'm a believer.

I've been eyeing the Delorme unit lately and wondering if it solves some of my minor issues (example: Garmin mapsource does not include multi use trails as routable paths, but there are work-arounds). But super detailed usage issues can only be discovered in real use. Manuals never get detailed enough.