I bought Kindle 3 3G June last year, mostly for the 3G option which indeed proved very useful. But I didn't like it somehow. Only after I put Times New Roman on it and another year passed... now I start to like it. At the beginning it reminded me a bit of my very first ereader which was nothing but stress and disappointment. Anyway when my Kindle successfully supplied me with Poirot books in a remote village in the middle of nowhere AND I could check weather and local events (with no internet access otherwise) I started to have warm feelings towards it.
So, I will not upgrade. I actually should get rid of 2 ereaders instead.