Lots of people have changed them, very easy to do. You can get chrome replacements that look much the same, S ones, "flame" ones, cross pattern ones... Try searching for chrome repeaters in the exterior forum and you'll find a lot.
I own the red Cooper. Got them from Moss Mini, bit expensive at about £90 but they are good quality, fit well and they look the business IMO.
Prefer the silver than the standard black but didn't want to change the look to a 'shark-fin' type as I think they can look a bit tacky. So I was prepared to pay to keep the OEM style just in silver.
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