Not great. Replaced all windows in my house with a...

Not great. Replaced all windows in my house with aluminium wood ones from Zoellner Sandweiler at substantial cost. Some of the workmanship was shoddy with some aluminium parts cut so roughly (and not sanded down) they are borderline dangerous. Also, the sales team did a poor job measuring so I ended up with windows much smaller than what the openings would have allowed for. Opening handles also of mediocre quality with lots of flex. As with German cars, reality doesn't live up to the marketing talk. Don't believe the hype. On the positive side, the installation team did a clean job during installation.