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Looking for reviews on Velux Thermo Plus glass with natural cleaning effect

As we expand our roof, we wonder if the natural cleaning effect of Velux's Thermoplus windows lives up to their promises. There are almost no opinions online. Has anyone had experience with this type of glass and can report?

I would be particularly interested in:

1. Does the cleaning effect work noticeably and over a longer period of time?

2. Will the coating stick or peel off?

3. I have heard that such glass does not let in all the sunlight and thus darkens the room? Is this correct?

• window
• velux