I went with cheap(ish) ebay ones because they were the only available in gloss black. They aren't horrible, but fitment is poor and most of the guys on the forum didn't like them at all. Had to put the flamesuit on for a bit.

I also tried painting my factory ones (professionally) and was never happy with them. Was not glossy enough and had way too many imperfections.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)