A comment
My opinion on the WDS profile is good. Easy to install, sturdy, beautiful and with proper installation does not deform in the Southern Federal District! There is no opinion on the loss of profile color, but seeing the installed WDS windows in people who installed them earlier, I can say that they are white when clean. A large role is played by the factory processing the WDS profile in windows, doors and balcony blocks. As with any profile, you need good equipment and a conscientious contractor, which has an impact on the quality of products! High-grade equipment from reinforcement to fittings, and not a cheap approach to business.
If the plant maintains the standards of the profile developer, then the WDS windows will work, work and work. Any profile can be turned into a fragile, liquid, poor window from the profile of Rukhau, WDS, Schuko, etc. Who collects your windows and on what equipment, what approach to packaging and what you are trying to save on when buying a window - this is a quality issue before installation, and the installer or measurer shows, even before the order - how the measurement is done and how, what and how many questions are asked, how many points are measured.
pros
Like any good profile and proper window.