I've got a D as well. I'd agree with the attention to detail lacking in some of the wood work fit and finish, but the rest is top notch on mine. For me the AK mag feature is worth the premium they go for these days. They are a fantastic rifle and never have a problem.
The KD versions look cool. They seem to go for very similar prices to the original D. I might get one if the price is right just to have another for my kids as the D's are rare and rarely come up for sale. One benefit I see is that the KD will most likely still have the provision to use strip clips, while the D does not.
I've got one more crate of Czech all on strippers that I'd like to make use of. Lever Arms sells Russian SKS bolt carriers. I'll get one next time I'm In the area and see if it'll fit in the Chinese D. If yes then problem solved.