I went and saw it and wasn't all that impressed. We rode the dart train from Plano and walked to the museum from the dart stop. Pretty good experience on the dart rail.
The exhibit itself is billed as King Tut, but they don't even have King Tut's sarcophagus like they show in the pictures. This one:
What they do have is a sarcophagus from someone who
may have been related to him. Many of the artifacts aren't even directly related to Tut, they're from other graves or people who may or may not have been related to him. I felt a little deceived because the DMA is presenting it like it's all about Tut when it's really not. I'd say it's about 1/3 to 1/4 Tut and the rest is just other Egyptian artifacts. If you just want to see Egyptian artifacts then I guess it's fine.
I would suggest buying tickets in advance because they let people in on a schedule. I think it's every 30 minutes. If you went up and tried to buy a ticket and all of the slots were taken you might have to wait a while.