I find it a bit difficult to look at the max throughput and basing a rating on that since it mostly depends on the setup of the clients. As you said it yourself in the video, you are using DOCSIS 3.x from Vodafone Kabel Deutschland. I too was a subscriber once on a 400/50 Mbit/s line and while I would reach 40-50 MiB/s download throughput with qBittorrent (they were short-lived downloads whatsover, content would be downloaded in a jiffy), it was significantly more difficult to maintain a good upload throughput for seeding. Something throttled me to exactly 1.5 MiB/s. It would usually start in the most busy hours of the day, usually in the evenings, and stop at midnight ± 2 hours. At weekends I was throttled the whole time.
I moved back to Telekom with a 250/40 Mbit/s plan last year, the upload was going up to 4 MiB/s but was never really stable. So then I noticed a very high load on the HDD and thought it wouldn't keep up with the random reads, so I replaced it with an SSD and now I can't stop crying tears of joy over the most beautiful, calm, straight line at exactly 4 MiB/s. It looks a bit like a calm ocean's surface now.
Oh, and regarding support, thank you for completely omitting the forums. Although it's not strictly speaking support, the community does solve many of the problems you'd normally create a ticket for. Some users praised it as a trove of knowledge, even if it can get quite technical. But it's at least another way people get this VPN up and running.