I paid $135 for 5 windows. I don't remember the %. Definitely get the felt. Mine eventually scratched. Not immediately, but after you get some dust or dirt between the window and the plastic piece it will.
I got mine a a place called WaxWerx in Indy. Lifetime guarentee, but they try not to honor it. I thought I was going to get in a fight after taking it back in the get the rear window redone after finding bubbles and dirt between the tint and window. I will get the sides redone at probably Ziebart, they were about $20 more.
Ordered 4/26/05. Picked up June 11, 2005. 05 Mustang GT Premium Coupe, 5spd, Performance White, with red accent leather (ICAP), Shaker 500, IUP, active alarm, side airbag, spoiler delete. MODS: Baltimore Street Mods 10' red stripes and red rocker stripe. window tint. K & N aircharger. Pony Package fender emblems. Added 18" Polished Alum. Bullitts Hurst comp shifter