The initial visit and quote was fast and efficient, though vastly overpriced. Negotiation knocked off quite a few thousand, so be prepared to haggle. The guys that fitted them were good, polite and tidy and initially we were delighted. How time can numb this though. First winter we had mold appear on all the mastic, something our previous UPVC windows didn't have! We continue to have to treat this. The real concern for me, having rung up today (8th January 2019) to report that the front door lock is faulty and we can't remove the key, is the apparent lack of 'engineers' available to come and fix it until the 31st. Having elderly and confused parents living with us, who can't understand how the door operates, results in them leaving the key in place, on the outside! This apparently isn't an emergency as I can work out how to lock the door. Wholly unsatisfactory service in my opinion and would suggest other look elsewhere if changing windows and doors. Unless you fancy house sitting for the next three weeks to keep the place secure. Personally I would use a local company next time, if you are thinking of replacement windows you might want to do the same.