As far as i am concerned and according to the german M-forum they were nothing but rebranded Pagids RS 19's but with street legality in germany but with double the price tag
I would just buy them directly, i heard nothing but praise about the successor of the successor, called Pagid RSL.
I run RS29, so the successor of the RS19 since a couple years, they work very well with the stock calipers. However they are a bit noisy (squealing and rattling).