Would agree with that. We've just bought a new tumble dryer and as a result of registering online we get 'priority repairs'. It also means you don't have to answer a stream of daft questions such as model number, serial etc when you are ready to take a hammer to the damn thing, as they should already have the info to hand.
If it's a Bosch, Miele, AEG or Electrolux (I think i've covered the various co-brands there), be prepared to receive regular "sign up for extended warranty" letters from their automated idiocy department.