I have the 750 and this is the lowest price I have ever seen.
Even a refurb at Vitamix goes for > $500 with a 5 yr warranty.
This seems to be a true open box as they don’t list the usual extras as tamper and cookbooks.
The deal breaker here would be if Vitamix would offer a warranty for a Woot open box.
They don’t cover ebay sales, but do cover warranties transferred from the original owner.
If it helps, Vitamix has sold millions of these in the last 7-8 years and only employs 4 people in their warranty repair shop.
This is the last work horse Vitamix designed before putting their future into digital with new accessories that may not work with the 750.
Best of luck!