Sorry for the delay Adam...not sure how I missed this one until now.
We use genuine Bosch.
I can only think of three times when we didn't use genuine Bosch B&P. One was a customer who sent in his own b&p (Bosch barrel and Zexel plunger lapped into them- junk). We also tried two sets of European (non-bosch) sourced b&p's. Both sets stuck at least one b&p and they were both been swapped out with Bosch shortly after. To my knowledge both the customers were aware of the non-Bosch B&P's sold at the cheaper price.