Was planning to keep the car for 3-4 years (although that may change when I see the new 4 Series
)
The Wheel Specialist claim they can do a better job - this is a quote from their website...
"The Wheel Specialist offer a TOTAL all over, specialist refurbishment that mobile alloy wheel repair services cannot offer, for a similar price to what they will charge for a temporary, cosmetic, touch up job. The finishes at The Wheel Specialist give an all over coating and are tougher and longer lasting and will last you for years to come. Mobile services cannot prepare the wheel as thoroughly or strip off old coatings prior to refurbishment so it is impossible for a mobile to achieve the same finish as The Wheel Specialist. In most cases they don’t even remove the tyre, they just mask it off."
However... The Wheel Specialist still only guarantee their work for 12 months, same as BMW so it's really down to quality of work. What I don't want is a wheel that I can see has been repaired without looking too hard. Mate of mine had a wheel refurb'ed on his ML and it came back two shades darker... stuck out like a sore thumb.