Data Usage, Teathering and giving up unlimited data

[carnage334]

With my new 4s I wanted to enable my hotspot, but didnt really want to give my unlimited data that I was grandfathered into. Looking back on my usage of data over the past year I don't see over a gig for one month. I was going to get the 4 gig data plan with teahtering from ATT. I'm just so torn on giving up my unlimited even though I don't make great use of it. I wanted to enable Teathering my for iPad mostly and my laptop once in awhile when only really needed. So if the 4s AT&T Teathering fast? Anyone to pull me in one direction or another?

Thanks!