perhaps you missed it, but there was another thread stating that the company has already raised it's prices.
I ordered our tickets for our trip last week through LMT. I had no problems redeeming our voucher. they asked for valid ID and also asked a few questions about the types of tickets I'd purchased.
the tickets themselves say valid through 01/16/2011, first visit must occur by 01/03/2011, expires 13 days after first visit.
the children's tickets showed a value of $179 and the adult tickets showed a value of $209 - in case you decide to upgrade while you are there. HTH!
edited to add: we did the 5-day hopper tickets.