I have read most of the posts on this thread and this is my Opinion~~
On all my registrations for my Biewers, it reads as a Biewer Yorkshire Terrier ala Pom -pon
Here is my take on whether Biewers are Yorkies....Yes they are that is their heritage. They come from yorkies...Yes, they are considered as a breed of their own... correct.. but it doesn't mean they are not yorkies. It just means a standard has been set for them. So I raise the question and I have to ask ??? For instance the Beagles... there is a 13" & a 15" aren't both of them still Beagles??? They have different standards!!! But are still called Beagles. Then another example Labs. Three different colors are allowed in this Breed but each color has a standard... Aren't they still called Labs???... Chocolate, Yellow and Black... So even though Biewers have their own standard they are still yorkies, no matter how you want to slice the pie.
My opinion on their temperment... I too have both and Biewers and American traditional yorkies.. We all live as one big happy family...

All of them get along and I have found that the Biewers were not much different from my other yorkies to the exception that the Biewers are more loyal and tender hearted. Each one of my dogs have their own personality. My first Biewer Eliah, I no longer have, finished potty training my other two traditional yorkies that I struggled with for a year. So I guess this has to go by each individual dog, not by the breed. I have read numerous posts on chewing issues, so I don't feel that this should be considered a Biewer issue. But a puppy issue. As I have had both breeds chew...
I would like to add that I do not belong to either clubs that have been established here in America for the Biewers. I do not agree in what they stand for or how they represent the breed for others to follow. I do show with the IABCA with my Biewers and will continue to do so until other doors open for them in the show ring.
Please note this is my opinion and my experience of both breeds of yorkies. I wish to cause no ill feelings with this I am just wanting to share my experiences and opinions. Everyone has their own opinions and should be respected as just that. This doesn't make me right not does it make any other person wrong.