I had a QP5 Sport GTS 2011 for 7 years and had 4 sets of tyres on the rear. Initially I changed the first time with the recommended tyres with the MAS marking but the second change set were normal P Zero without MAS marking . To be honest I noticed no difference. The last set were the same and I bought some which were already 2 years old on the marking but new tyres, This saved alot of money. There are a few sites such as tyreleader.co.uk who sell now tyres and also note the DOM (date of manufacture) and if abit older they mark them down with delivery in the price. I paid £15 a corner to have them fitted. Saved ALOT.
My QP5 Duoselect i had before i had Pirelli originally but then actually put Vredestein on as they were much cheaper and had used them alot before when living mainland Europe. Again I didnt notice any difference in road driving.