Global QDP hasn't changed their formula in probably 50 years. It is still the same great film it always has been, and will stand right up there with Llumar and 3m. Which is why I install it every day and have no worries about any problems with my film.
Go with the Global shop (in my opinion) not just because of the film, but because it should be a better experience than a chain store like TintWorld. You should get a more personal experience from a smaller shop with a quality installer or two rather than a chain with a bunch of guys with minimal experience putting plastic on windows all day.
