The D Buzzzes have been coming out pancake flat and apparently beyond flat, mine is slightly sunken in too. I don't have a camera to compare; but if you happen to have another Buzzz set them down side by side on a table, hunker down and check out the difference in the rim. It's almost like a different mold entirely, or perhaps due to the cooling of the baseline plastic.
Before the first tree they fly most like a shorter, worn, flat Z Buzzz. After that it's anyone's guess. They will flip and turn nicely but never as consistently as a nicely worn in X Buzzz simply due to the durability of the plastic. D plastic has the durability of a piece of Bazooka Joe bubble gum, so expect to see big dents and dings if you hit anything.
I'm a Buzzz guy too, going on 6 years, and my reccommendation for you is to stick with the other plastics (you know how good they are) and hang that sucker up on a wall to display your Buzzz love.