Yes. They work very smoothly for enabling TotM, 13A uses them, for instance.
Well, that's /a/ problem, certainly. In the Next playtest a wizard wanted to know how far back in a group of kobolds he could target his fireball while still catching all the ones in the front (blocking a 15' opening) - obviously the wizard could center his fireball as much as 18 feet behind the lead kobold and still catch his buddies on either side. Ok, it wasn't obvious to the player who was thinking he might need to drop it right on the leader (I guess he confused radius & diameter), so good thing he asked.
Oh, so the solution to that problem of running TotM when the game uses geometric areas in feet:
game with engineers.
Apropos of nothing, but GURPS used a 'hex' that was 3' across, but 6' high, which seemed odd, at first, but it was, what our local GURPS enthusiast called "a people tube!" so it was actually pretty easy to visualize/estimate relative sizes/areas/distances in hexes, because the size/proportions of a person is pretty familiar.
Oh, but we're in the process of transitioning! Eventually everyone will use the Metric System. I mean, like, no later than 1984... Certainly in the far-flung future of the 21st century, we'll all be driving flying cars with speedometers in kph!
Range bands are hella gamist, by comparison.
I mean, you're OK converting square feet to square meters, but multiplying or dividing by 5 is too much for you?
Really, a fantasy RPG should use some archaic unit of measurement, like ells or rods or the Roman /passus/.
...ooh, actually the standard units of length in D&Dland should be the Pole (10') and the Rope (50') ;P