Yes, I am. I'm leaving AT&T. I've been very satisfied with them, but I'm jumping ship for LTE and for the ability to unlock my phone for travel abroad.
I currently have an LTE hotspot, which I'm going to combine with the phone on a shared data plan. At some point I may cancel the hotspot as I really don't need it anymore.
The shared data plans are a decent value IF you currently pay for tethering or are a very heavy voice user. Otherwise I agree that they are not much of a value.
However, it looks as if other members of my family may eventually join on the shared data plan, so ultimately my costs would be lower than they otherwise are now, plus I get unlimited minutes (not that I really need them).