There is a lot to say about this pedal, so I'll keep it short.

It's is in a way a more intense and focused Fathom Reverb by walrus but something completely different as well (I use both, and I'm very happy), the Slö is great for soundscape-ish, deep, immersive reverb tones and/or more modulated textured sounds, great with more basic reverb in front, like the fathom for example.

The Slö also features some amazing and varied functions with the 3 modes it comes with, the "Dream" (Latched) mode is the first go to in a way of tasting what this pedal can achieve, the "Dark" and "Rise" are secondary to some people who use this pedal (from what I've seen), but well explored can go to great lengths as well.