Some of these reviews are going back a bit but mines as of now April 2016. And I say:-
USE THEM AT YOUR PERIL, YOU HAVE BEEN WARNED.
Windows fitted in February, but reported a leak soon after, on the inside directly under the window, a window which had been fine and watertight when old windows were in. After some delay, they sent two different window fitters who said they could find nothing wrong, but tried to blame the exterior rendered wall, which had not previously been an issue. So this argument was ongoing when a week later a second window started to leak in exactly the same manner, damaging the internal wall directly under the window, which my tenant took photos of on his phone.
They were called again and after a lot of calls, and hastening, they finally agreed to send out an inspector, since they now knew there were two windows with the same problem. The Inspector came earlier than agreed, so I missed him at house, but caught him in street, and he told me that the installer had drilled and screwed the frame at bottom, in a drainage channel, and this should not have happened, and so rainwater was getting past the drillings, He said he had arranged with the tenant for fitter to come on the following Thursday to make repairs. Mmm this is repairs to new windows!!
I'm on holiday the week he proposed and the one following, so ask my tenant to make sure they check them all, not just the two leaking ones, since they would likely have all been installed the same way.
I then come back from holiday to find that nobody turned up, so called them again and had to explain yet again to a new person, who said they were busy and could only do it in 3 weeks. There was very little apology for the unexplained failure to attend as agreed previously, so they were informed that 3 weeks was not acceptable since the water will be damaging fabric of property, so the best they could do was 10 days away on a Saturday.
Saturday finally comes and at 9:30am the tenant calls to say different guys from before had turned up, and claimed they did not know what the problem was, so the tenant showed them his photo on his phone of he wet wall under the window. Their chosen course of action was then to ask for a cup of water, and poured down window, and said whilst scratching heads, "dunno what's wrong mate, its not wet now". "Office will have to organise someone to remove the facings and trim to look see". Great effort and technical knowledge there then, thought you were there to take action to put right the problem. Well done Dalmation, they were really enthusiastic.
So after the call from my tenant on the Saturday, I'm stuck with waiting to call them yet again on Monday, which I do, asking for the installations manager, who had spoken with me before my holiday, a well spoken gent, who at the time said he would take control, and I fact had sent the inspector. The call seems to take a while to be connected, and finally its answered by a woman who says "Yea", to which I say I was hoping to be put through to the installations manager, but the woman insists she's the installations manager. Upon that response, Im thinking Im being fobbed off here, since this is a person to whom I've never spoken too before, even although I have spoken to a gent previously who also purported to be the installations manager. So at this point the woman was more upset at me saying it was odd her saying she was the installations manager, when previously it was a gent I spoke too, than actually solving the problem I have with their ongoing and never to be solved leaking windows.
So after all that I'm expecting a call back from the installations manager with some proposals for action, but have now warned "the installations manager (the female one)", that I will get trading standards involved, and take a small claims action to court, if I do not get some satisfaction by way of immediate action. Looks like I may be waiting awhile now though, since on looking on here, there appears to be a pattern forming of lack of action, and fob offs, from them read more