I bought a pair of the bookshelf speakers the other day and so far I’m fairly satisfied with them. I’m using them as a stereo pair for music and in a 2.0 setup for watching movies on a projector with an Apple TV.
To my ears, a single bookshelf speaker doesn’t sound as a good as a single Sonos One - there is a certain amount of clarity missing in the lower ranges - but as a pair they sound good enough for me to enjoy music without noticing any obvious deficiencies. I’m especially happy with their performance for movies as I found that dialogue is a lot clearer than on the Sonos One we were using, and the bass isn’t too overwhelming which is good for us as we live in a small terrace house. (I appreciate that the Sonos One wasn't really designed as a speaker for movie audio)
Physically, the speakers look nice enough but are a bit bigger than I thought from looking at the photos. The mounting system is good and the cable routing options are well thought out. Unfortunately the power cable itself is quite short and doesn’t reach the floor where I’ve mounted the speakers at shoulder height (admittedly, that's quite high up and I can imagine Ikea designing the power cable to not leave to much excess when mounted at a more usual height).
A small but useful thing is that if you have one of the Symfonisk bookshelf speakers wired to the router then it will create a mesh network for the other speakers (the same as "proper" Sonos speakers). I wasn't sure it would do this as I don't think I saw it mentioned it anywhere in the reviews, but I'm pleased that it works as my Wifi is a bit rubbish.
The lack of voice control isn’t really a big deal for me (and having Airplay 2 support is a big win), but if you really want Alexa then you can use an Echo Dot and set the bookshelf speakers as the default device for music playback.
BTW, I had previously tried the large Eneby Bluetooth speaker for the bedroom but I sent it back as it sounded really muddy and felt quite hard work to listen to. the Symfonisk bookshelf speakers are an entirely different proposition.
I think that's all I have to say on the matter... if anyone had any questions about the speakers then I will try to answer as best I can.