We have been very pleased with DU. We have eight rooms booked with them for 11/29 and in addition to the DU discount, they have gotten us lower rates than originally booked rates. They do this automatically without asking. When the lower rates came available, DU contacted us without us even knowing about the rate availability. In the case of 4 rooms, there was no discount for the booked category, but DU checked a higher category that had a discount rate $300 less the the lower original category. They gave us our options, and had new room assignments as soon as we said go! So we got upgrades and saved $!!!
They have been very quick with answers to questions, and always helpful. We have dealt with Tammy, and I agree with the previous post that she has been great!