Myself having unlimited 4G data I think about how lucky I am.
As an example, today I watched the IndyCar race with my phone. I would never have enjoyed that w/o an unlimited plan. I would find myself constantly looking at my data usage. Simply put that would suck. I stream radio shows at night falling asleep and never worry about it shutting off. I Skype with my mom and could care less how long we talk. I watch old westerns (Gunsmoke) on YouTube.
You see what I mean. My question is, how often are you thinking about data on a plan that defines thresholds like 2 or 4 Gig's. Or does it not even matter as you never use all your data....... or if you do you simply pay the per GB charge and could care less.