I think the general rule of thumb with any of these paint protection systems, is if you don't like polishing your car, then they are worth it. As long as they are applied correctly by the dealer, they do work and keep the car looking good. Still worth negotiating with the dealer over price. You'll get at least 50 quid off, possibly 100 if you're feeling really nasty( it is do-able, I promise). The salesman is on commission (obviously) but is also targeted and paid on add-ons like supagard,lifeshine,scotts etc and he'll do a deal with you. The trick with any negotiation though is not to come accross a smart @rse or aggressive with the salesman. That will not get you what you want.
VWmd