This looks like a pretty useful GPS unit. The kind I would buy, had I $400 to blow. I'd want to see some of it in action before I bought it, but it seems to have it all. Speed, altituted . . . you can plot courses, set up workouts and the like. If you've got to have GPS on your bike, this seems like a good choice.

The big downside is that there are two options for this model: heartrate monitor OR cadence monitor. You can have one, but not both. Right now I have neither, so it doesn't matter, but I always thought that if I were going to pay for a get up like that, I would want both of those features, and possibly more. Seems kind of wierd that they would do that. Probably because they are both wireless I guess.

[edit]whoops, forgot the link:
edge 305