I got a glass window and door from Marvin about four years ago and really disappointed. Think the door must have been hung incorrectly - it doesn't stay open long enough to even walk through so always have to use a door stop. The handle on the door, also, is constantly falling off. On the plus side, they made to measure with an outward opening and although made of pine, it seems very solid - when getting an alarm installed the fitter commented on how difficult it was to drill into the wood as it was unusually dense.
Probably should start a new thread for my question - does anyone know of a supplier/fitter of steel windows. Am looking for a direct replacement for old iron windows with narrow profiles. I find pVCU, alluminium, wooden frames too thick. Any companies I've found are all based in England.