The window system is great.
The two-person team who did the install were friendly, tidy and have done a very neat job. They also had to lug their gear up and down the lane from the high street (due to parking limitations) and did this all without a grumble or complaint.
All in all, I am very happy to recommend. The window system is great, condensation pretty much eliminated, it feels warmer already and it does a decent job of noise reduction.