It doesn't seem particularly well known. It works fine with TLS, but the origin servers need to do the TLS termination (IMHO, this is better for security than having your load balancers do it, but it does mean you have to work harder on key distribution). On a non-DSR load balancer, doing TLS termination on the origins means the load balancer has less application data to work with (request path, response status code, etc) in making load balancing decisions, but for DSR, the load balancer never had any of that, so adding TLS doesn't disadvantage the load balancer any more.

TLS session establishment is expensive, so why would I want my load balancers to do it anyway? :P