I ordered windows for my apartment from this site, and it was very convenient to place the order. A big plus is that you can calculate the preliminary cost of the windows directly on the website. The manager called me back within an hour, and we discussed all the details of the order, the deadlines for the work, and the cost. They installed Rehau windows, and the installation was done properly, I have no complaints. They've been in for over a year, haven't yellowed during this time, and there have been no malfunctions at all.
