It should, theoretically, be cheaper to do it later on. You'll be able to get a better price through the service department, as you're effectively dealing direct. Otherwise what happens is the service department charges the sales department, who puts their mark-up on it, then charges you.
If it's a lousy job, and it happens from time to time, take the car back and have it sorted.
I've fitted a few on cars that have been with the owner for some time. Only difference to me is the overall cleanliness of the vehicle. I prefer to work on them before the owner takes them down every dirt road in the district
'07 Transporter 1.9 TDI
'01 Beetle 2.0
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