Price is interesting enough to explore. Used is a bit sketchy though.
Agreed, reviews seem good though
If they operate the same as the place I work for most mills are still in great shape as we only make a set number of cuts before stopping use and discarding. Our machines have tool counters and tell us when to replace a mill no matter what condition it is in. And so far the used mills i have bought from ebay have been in great shape. Use your own judgment and research the seller and ask them questions before making a purchase.