I've had unlimited for a long time. It's $30 extra a month but unlimited high speed is great. I think it's been about 4 or 5 year's that I've had T-Mobile unlimited data. Then they stopped it for a while but I was grandfathered in. The biggest down side to having unlimited data is you can't tether.
But I have Road Runner extreme in my home. I get about 20-25 MBPS Down and 2.5 MBPS Upload.
It's not as fast as T-Mobile's LTE but here in Hawaii the LTE is only in a small area. It's so spotty you can't hold a connection for more then a few seconds before you're back on HSPA. And now HSPA, is so slow you're lucky to get 1 MBPS Down and maybe a few KBPS Upload. Back a few months ago HSPA was the best. You would get no less then 7-8 MBPS Down and 1-2 MBPS Upload and that was the slowest. On average it would be more like 21 MBPS Down and 3 MBPS Upload.
So I'm just waiting for them to fix LTE so it's usable. They either really messed up here in Hawaii or T-Mobile LTE is crap everywhere.