I've been happy with my Synology DS218+ as well. I use it to host some Docker containers for home automation and some other things, both with and without Docker compose (need to use the CLI to get compose working).
The one thing that burned me recently is DSM version 7 removed support for any USB device that's not a mass storage device. This effectively kills a lot of what I love about the Synology. Next time I'll probably roll my own.
Likes: The ergonomics! This keyboard is really comfortable to use for long stretches. It has reduced the strain of using the computer. Thumb keys are great.
Dislikes: It took me a while to get comfortable with it, especially for programming. I had to really focus on it for a while, but it was worth it! Also, as mentioned earlier, it's not great for games. The placement of some of the modifiers makes it difficult for some shortcuts, but you can always customize/reprogram it.