Glasscoat is a great, long lasting product that will not simply wear away after a few washes. In fact you would have to wet sand the glasscoat to remove it. The 7 year warranty on the product is well woth it, if you are not over paying. In my opinion, you should not have to pay more then $500.00 for this and I only recommend it on new or 1-2 year old vehicles. The reason is it forms a “ceramic glass resin” that seals the paint to protect it and if your paint is not properly cleaned before it is applied then you could be sealing in impurities.
In regards to technicians installing this and it taking 20 minutes, you must not have worked for a reputible place that gives what they offer.
As far as paints not changing over the years, I think you should do research prior to making such a comment. Paints today are more water soluable and are softer due to the enviormental effects and costs. Manufactures often ship vehicles with the white covering to protect against acid rain, bird droppings, etc. If paints were so strong then why would the factories pay money to cover the vehicles? Why do factories not guarantee the paint against the acid rain, tree sap etc?
There are dalers out there that overcharge and are not as honest as they should be, there are also those that are reputible and are honest, so i say if you trust the dealer and they seem fair with what they charge the Glasscoat is well worth it.