@X5diva: many thanks for your response! Must admit I am tempted to get the 3M anyway to avoid the chipping, it's just that I've recently spoken to two X5 [spam link]s who don't have any chipping problems, and interestingly have the 19s (same as I have on order). It'll cost me close to $1000 to get done here so if it's not necessary would prefer not to obviously!
@Sean18337: many thanks for your input also! The dealership can't do it, but a mobile supplier can fit before I collect - would prefer to do that if I get it done rather than risk chipping on way to fitter. Do you mind me asking if you have 20s or 19s though?