tax really kills this deal. After tax the price is $1,807.23 for a refurb 90 day lens. A brand new version is $2086 on amazon after 2% rewards and a 1 year warranty, a difference of $280. Essentially you're paying a dollar a day more in order to get a brand new lens. Also, I am unsure if the refurb lens comes with the hood and case.
The refurbished lens should come with everything that a new L lens comes with (hood, case, manuals, etc.), the only difference will be the packaging and 90 day warranty. Most likely the hood and case will be brand new.