We had a relatively good company fit our house with PVC windows. So now we match the rest of the street.
The windows themselves are reasonably well made, though each weld represents a weakness, and despite what the rep said, I doubt they are steel reinforced.
The measurements were poor in part. Some of the windows are 2cm too small. This isn't obvious because the shortfall is camaflauged with a uPVC strip.
Damaged areas of plaster inside the house are repaired by hiding with PVC strip. I would have replastered these areas.
The house has small lead covered roofs over the two front bay windows, separate from the main tiled roof. These are supported at the front by the windows, and at the back by an original timber joist. They haven't jacked one of the bay roofs up properly before removal/refitting windows, and it has dropped a bit at the front, and is now a slightly sloping roof.
Overview; visitors think they're nice, they look fine, won't let in the damp, are a lot warmer, but craftsmanship is lacking on close examination.
Tony