I actually prefer getting car maintained from 3S- If someone messes up, it's the dealerships responsibility to correct it.
The only thing I hate is that the record only stays with the particular dealership- I once got oil changed from Suzuki Jhang, that's 150km round trip, I would never drive there to get a copy to show potential buyer how good I have kept the car.
Wish it could all be centralized on 1 server and you could literally walk into any S3S dealership and get a full maintenance record. 