I love my Explorist 500. I do have a few complaints though:
1 - The redraw is too slow. Especially when zoomed out.
2 - When I "view" a geocache, it doesn't maintain the same zoom level as I'm currently using. I have to zoom in several levels to even see the street names.
3 - Inconsistent accuracy. If it were a bit inaccurate I could compensate for it easily. But the inaccuracy isn't consistent. Sometimes it's perfectly accurate. Sometimes it's only 5M off. Sometimes it's 10-15M off.
About #3: I tested this with a known cache. The first try my 500 was off by about 5M. I then walked around in circles and random directions an then headed straight for the cache. This time it was 100% accurate. Then I tried it again, walking around in circles and random directions, and walked straight to the cache from another direction; this time it was off by 13M. What the heck? It was telling me the cache was 13M BEHIND me.
How can this be? In a matter of minutes it went from 5M off to 100% accurate to 13M off. Weather was light overcast. So I can understand if it's off a bit, but I just wish it was consistent.
Other than those compliants, I love the 500. Really bright screen, loaded with features, built-in geocaching. Fantastic!!!