I have 4G in my area but don't use it for the following reasons:
- turning on my 4G radio consistently causes my phone to lag like crazy...my biggest issue (there's a thread discussing this issue)
- 3G is "fast enough" for occasional browsing and streaming Pandora/Slacker
- when I move in and out of buildings there is a delay in changing between 3G and 4G that causes data transfers to stall
- more battery drain (I estimated my typical use to be 5hrs on 4G vs 8 hrs on 3G)
- inside my work building, I get no 4G reception; otherwise I'm at home using wifi
4G is significantly faster (~2500kbps vs ~600kbps) but it's only a big benefit when downloading a large file or website, which isn't often when NOT on wifi. IMHO in everyday use, it's not that big of a deal.
I know those in non-4G areas are probably not understanding why there would be people that have 4G available and not using it, but hopefully the mass will soon have it available to experience for themselves. I know the tech is in its infancy and will advance, so we'll wait to see what the coming years bring.
EDIT: I thought I'd bring up that I really hope things get better really soon because a HUGE benefit of 4G is that data and voice can be used at the same time.