I only have 6k mi. on them in 1.5 yrs but my replicas still look pretty good as far as the clear coat goes. The only "natural" blemish is what looks like a dried water streak but it's in multiple places that soap/water can't get off. Only noticeable when up close and washing.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr