The problem with these maintenance klans is that the dealer will only do the services as required by the service schedule as laid out in the owner's manual. This leads to many additional trips to the dealer, unless you want to pay out of pocket for the other services...ie if you are doing the 3 year DCT fluid change, they will not do the canister filter on the plan, if it is not at the prescribed mileage.
I generally don't have the time to take car to a dealer once for an oil and filter change, then Cannister Filter, and then DCT Fluid change, then air filter, etc.
Keep in mind, these plans are sold because the dealer makes good money on them, and most owners do not actually get all of the services that are included.
With that said, I am also one of the people that do not trust the dealer to do the work correctly - with my free oil, filter and Cannister change, there was 1.5 litres too much oil in the motor, and oil spilled all over the shear plate. Happy to do the work myself, and did, including the DCT flush.