So after talking to our VZW rep yesterday, our current monthly bill hovers around $2600 (it was over $5k when I was given the account to manage several years ago). Once we switch them all to unlimited, we'll be paying around $2000, plus tax, tag, title, trade in and the blood of a virgin.
It's very rare to hear me say anything positive about VZW, and I was a personal customer for over 15 years, but from a business point of view, they hit a home run with this new unlimited plan.
EDIT - There are a handful of lines on the account that are legacy unlimited data, and are constantly going over 30 gig per month and have never noticed any decrease in speeds. Might be because it's a business account but I can't confirm that.