Very stable, very good quality. It does not succeed at its advertised speeds, but this is perfectly normal when your house has bad electrical wiring (as mine). From 100mbps internet (router), it gives me around 70mbps with one pair.
Low latency, surely better than WiFi if your room is not in range to your access point or you do not have a proper WiFi mesh network in your house.

Every 2 years one burns out on me. And imagine, it's a German company.
I need it for work.. but for the job it does, it's very expensive

The truth is that I was disappointed with this product, not that it's not good, on its own it worked fine, but it didn't work (unfortunately) with my existing devolo powerline from the 550 series.

Yes, it's worth the money. Rarely disconnects, good speeds. Guarantee, security. It won't disappoint and annoy you. We buy it with closed eyes.

After 2.5 months of use, it has not disconnected even once and the speed is excellent. I have a 50 Mbps connection in a small office and the line transfer is done in the same space and on a single-phase power, so I assume it is not a difficult case anyway. Nevertheless, I am completely satisfied so far.

I had a problem with the previous Adapters at home (TP-LINK), they had significant speed loss and occasional disconnections. I have a 100 Mbps VDSL connection and in the best case scenario, with very little network traffic (late hours), I would reach 75-80 Mbps download speed, while seeing that the router is locked at 96-99 Mbps from the line. The power outlets are 15 meters away. The power in the house is three-phase, I don't know if that played a role because Powerline technology is a bit peculiar. Now, with these specific Adapters, I consistently reach 92-94 Mbps during peak hours, and in the evening it consistently locks at 95-97 Mbps.

They have been installed in a two-story house, one on the lower floor and the other on the upper floor. It took me half an hour to make them work with manual pairing because the automatic "magic" never worked. They worked well for an hour and then lost their connectivity again, so I had to start the manual process all over again.

I had the old Linksys PLSK400 in the exact same sockets, which simply worked when I plugged them in and still work until today.

The Devolo may seem top-notch, but they probably only work well for short distances on the same floor. Considering the amount I paid, it's a complete disappointment

Excellent!!!! I bought it as an additional device to pair with other existing Devolo devices, for which I have already submitted a detailed evaluation and information.
A new element that I consider it my obligation to add is that in a technical configuration issue that I needed for a specific reason, addressing Devolo.gr, I encountered an excellent, polite, patient, truly professional representative who tirelessly guided me over the phone for about half an hour, so that I could proceed and successfully complete the specific process smoothly. Well done to them!!! Full support and assistance even after the sale!!!