They actually have more than one model for each size. The have a version for Jobo tanks with a one inch center core.
Originally Posted by frobozz
And to answer the original question: new, used, doesn't matter, the Hewes design hasn't changed, and they only have one model of each size. And while it's always possible to buy a used reel that's been dropped and bent, that's much much rarer with Hewes, because their spiral wires are *massive* compared to everyone else's. (Which is why they stack up a little taller in the tanks, meaning you have to choose your multiple-reel tanks carefully or you won't be able to get the cap on.)