I would not risk it because the seller has very little feedback and does have one negative. Also, a lot of the feedback looks like it was given when the person got the vouchers (or whatever) BEFORE taking the trip. (Since the feedback was shortly after the purchase and the "fine print" says you have to make arrangements ahead of the trip).
There are also a lot of unclear details, like just how many days of tickets do you get, what happens if the airport changes (since it says that can happen), etc....