I don't know about that...I got a Garmin nuvi 200W for Christmas and I've already logged 13 finds with it, only had a couple of DNFs, so I'm pretty happy with it. I can even download the GC#### and coordinates directly from the geocaching website...they show up under my Favorites. You use what you got 'til you can afford to spend the $$$ on something better.
I will say, one major downside is they're not waterproof...and let's not forget the short battery life. But I get driving directions to get me close, then I switch to Pedestrian mode. Most of the caches I've found have been with-in 5-10ft of where the nuvi directed me.
