Yes, they have a lot of shortcomings, but the hardware and software are both pretty good. When I had VDSL, it worked well as it mitigated the impact of powerline frequencies on the VDSL signal: both teh powerline and Fritzbox exchanged data on SNR and powerline adapters either reduced or increased power output, depending on the outcome.
So, it is what it is, but I suppose it's better than other manufacturers.
I agree with you, though, that it should be clearer in the datasheet etc. that the only gigabit port is on the LAN adapter, whereas the WiFi ones have 100Mbps ports. It doesn't bother me, as I don't connect anything to the ports on the WiFi units, but clarity is what would be best here.
I've used Devolo powerline adapters for nearly two decades and they're really a good piece of kit. It's my personal opinion, though. However, the latest Magic 2 and Mesh WiFi get very hot and freeze, plus when I tried Magic 2, it caused a lot of errors on the VDSL line. Now that I have FTTP, it doesn't matter, but because of the issues prior to that, I'd had to get Magic 1.
What I'd like to find out is whether someone with these could confirm their download speed, while being connected to Devolo, if their connection is over 80Mbps. This would either confirm or not whether it's my set up or a general issue.