I'm not sure it is worth it. The GPS feature isn't all that great, just a little more accurate. I don't have 3G where I'm using it today (I will on Monday), so I can't compare that. Otherwise, there really isn't a lot to drool over. The metal back of the first gen is much nicer.
The plug for the cord fits too snug on my 3G, I like gen one better. Oh well.