Yeah I agree it does come down to "how long am I going to keep the vehicle", I did cancel the service plan for the mazda 3 with another dealership and was refunded if you do this normally costs a 25 pound administration fee, if I remember rightly it also can be transferred if vehicle swapped within the group. I basically took it out for the following reasons, firstly as a another bargaining tool when ordering new vehicle that came with 3 year servicing thrown in, secondly as we had the white sport nav from new and it was low mileage i decided to keep it for the next 3 years, ( unless the cx-9 arrives next year) thirdly was the price and fixed as you mentioned. But each to there own it won't be suitable for everyone but suits me for now.