Decentralized ventilation system: Which manufacturer?

Hello everyone,
I am planning to retrofit a decentralized ventilation system. Are there positive experiences with it?
Which manufacturer is recommended? There is a lot on the market, but it is very difficult to assess what is good.

I would appreciate suggestions. You really don’t know where to start.

I'm also wondering whether to get devices from suedwind from Italy or from the Raumluft-Shop dot DE, the Rücklauf 50 RAS. With the latter, you even get a calculation and installation suggestions, etc.

Can someone say to what extent such a corner installation using the window reveal is compatible well or less well with an ETICS?

I will install the inventer with the new wireless module myself during the new construction.

can you please tell me the exact models and how you control them? According to my research, it is actually only controllable with Easy Connect or the smart HUB.

In January 2020, I purchased a ventilation system Rücklauf 50RAS Allergiker-Set. Delivery was fast. However, the thing vibrates in a natural frequency but only in one direction and makes noise. Despite multiple inquiries I have sent since February 2020, I have received no response to this day (June 14, 2020). Here, they only sell! Anyone hoping for customer service should stay away.