"we get what we pay for."
you pay baratilyo price, you get baratilyo product.
my casa-installed tints look ok... they're nine years old...
and, i think, tinting all the way to the edge of the window glass might not be a good idea.. the tip of the window glass is where there's a lot of friction rubbing.. after a few days of use, you may not like the scuffing that will begin to show up there...