The windows look good and the fitting of them is good.... but the trickle vents are very poor. We replaced them because our old windows were letting in alot of sound from the road. It felt like a window was open and we struggled to sleep at night. We decided to go for a more expensive window company because we wanted to be able to relax with knowing the windows would be better. After having the new windows fitted we were very disappointed because it still felt like a window was open. Their design of the trickle vents have let them down considerably. I rang the company and the sent someone out who advised me to stuff the vents with kitchen Paper! The vents have no draught proofing or rubbers seals on them, they are just an empty space for wind and sound to pour through. I might aswell have kept my old windows in and saved thousands of pounds.