I buy from Velux because I trust the quality of the products. I have Velux manufactured sky lights and this order was for a roller blind for one of them. I fitted it myself referring to the Velux fitting app.. I have also purchased and fitted the blind adapter however, the adapter design is not very good. The angle is not suitable for the angle of the Sky light/sloped ceiling. When the blind is pulled using a pole a person will automatically pull straight downwards otherwise the pole bottom end will hit the wall. I think the design team needs to physically check this and design a different shaped adapter to compensate for a person pulling downwards. Other customers have mentioned the same issue.