Fitted some Gloss Black Grilles to the E89. I was going to go OEM but I couldn't seem to find any below about £110 and I was a bit disappointed to read the OEM slats are a satin not gloss, its just the outer rim thats gloss. So I took a risk on the M Style ones at circa £50 as their all gloss and had decent reviews. Well so far so good, they look pretty good and fit fairly well. The plastic tabs are a little more brittle than OEM so you have to be a bit more careful fitting them, so you don't snap any. The paint finish looks good.
Also got around to polishing it after a wash and clay. Used Chemical Guys White Light Hybrid followed by Collinite 845. Looks pretty good for a white car although it I'm honest I'm not sure how much extra the White Light brings to the party as I couldn't really find any impartial reviews, everything on the net seems to be a Chemical Guys sales pitch. It might well have been better just using the Collinite,