Just FTR... I have a 705 and I love it, but for actual "exploring," you really still need paper maps. The screen on any GPS is just too small to be able to display both a bigger picture of where you are vs. where you want to wind up, and at the same time all the secondary roads between the two in a way that you can actually see them and explore them.

It's WONDERFUL for plugging in a pre-mapped route and letting it do the navigating. It's great for figuring out where you are so that you can locate that point on a paper map. It's okay for doing the navigating automatically when you're completely lost without a map and just need to get back home without panicking (although it doesn't always choose the best cycling roads - it does have car settings though, so you can use it in place of a car GPS as well, where I'm much more inclined to trust it).

But it's not a substitute for paper maps when you want to go exploring.