First flight on LX since this went online. Asking 25 EUR indeed, however I was assigned 19A and 5F, so not too bad. Seq 46 and 36 respectively, both A220 (one of them BT wetlease I think).
Weirdly enough after checkin was completed, I was able to change the seats for free. A good amount less choice, but seeing as 19C was taken, I've swapped for 19F and 5A so I can still enjoy both sides of the C-Series and hopefully with an empty seat next to me.
I used my M&M FTL for this booking.