Really good quality product and excellent instructional videos on the website. Saved a few hundred pound doing both cars myself. I opted for the twin layer for both so can't say whether it is better than single or not. I initially ordered a 50% tint and when it arrived it was too light (tinting to prevent sun shining in children's eyes), I hadn't opened the role and after a few emails i was able to exchange for a darker tint for just the cost of postage which i thought was excellent customer service.I haven't fitted the rear screen yet as I don't have a heat gun but the sides were easy enough to do. I will definitely use again.