I haven't heard of kinking issues, but there are known facial deformities in the "super" black pastel and "super" cinnamon lines - there are healthy panda pieds and healthy super black pastels (I have one), so it seems like 'black pastel' itself is not causing the deformities, but rather there is some other mutation somewhere genetically nearby 'black pastel' that can cause big problems (snakes that are so unhealthy they have to be euthanized or never make it out of the egg). This type of drag along mutation happens a lot in domesticated animals (think about major health issues in breeds of dogs - obviously we didn't *mean* to breed in hip dysplasia, deafness, or cancer, but a 'bad gene' came along for the ride because it was neighboring really good genes like 'kindness' or preferred 'coat color')
I would be careful about which 'line' of black pastel you pick up because of these issues, especially if you're starting with a pied and a black pastel (you will invest a lot of time, money and luck in the project - best to start with solid genetics).
I think it'll be great to see more of these guys, but the odds are tricky (just like with clown pieds, desert ghost pieds, etc) - any time you need a double recessive or double super, you'll hit a bottleneck of 1/16 :
if you get pied x black pastel to start, you get lucky and get 1.1 black pastel (1/2 chance) het pieds (guaranteed) for babies... you wait 2 years for your female to be ready...
THEN you need to hit the genetic lottery:
a black pastel from mom (chances are 1/2) x black pastel from dad (1/2) = 1/4 chance of super black pastel
pied from mom (1/2) and pied from dad (1/2) = 1/4 chance of pied
1/4 x 1/4 = 1/16 chance of super black pastel pied == panda
This bottleneck considerably slows down the number of successful morphs you see hit the market. If someone gets lucky enough to breed one, chances are that animal is a holdback for at least a few more years!
Good luck!