I was delighted to find a company who specialised in vinyl window films. The video on their website was great and showed you exactly how to install the films professionally. I also liked the fact that you could buy the tools to complete the job too. The site was easy to order from and the product arrived securely boxed and within their 2-3 days timescale. On installation - I was placing the film on the bottom half of 3 x patio doors - the film went on like a dream, the only reason I have scored 4/5 is that when I got to the last piece and removed the backing I noticed that the plastic was damaged towards the top. I then had to re-think how the last piece should be installed to make sure I could cut off the damaged piece. Then I had to go back and trim the other 2 to make sure they were all at the same height. This made the installation a little tricky, particularly in trimming the top part and making sure they were all even and straight. It looks great and has done the job, just a shame about the damage otherwise I'd have scored 5/5.