Honestly, I'm in love with this reverb. I use it mainly with Behringer Odyssey (sometimes with other analogue synths).
My main experience is with digital ITB reverbs (plugins) and I'm quite picky. many years I've been looking for a reverb that is not either an emulation of a real space or digital emulation of such. I've been looking for a reverb that works as "an effect" that enhances the source signal but it's not taking over.
Spatium mode:
The sound is beautiful. It's like a cloud or pillow that surrounds the source signal, but it never gets in its way. Even when set to 100%. Reverb is not cluttering the sound when set to long times like many other reverbs. It's not metallic. Modulation, even when set to higher levels doesn't sound like a chorus added on top of a reverb. Spatium mode is very well calibrated for trance-y plucks, synth arpeggios etc. I'm pretty sure that it would sound awesome on an acoustic guitar (I wish I could play one to check).
Shimmer mode:
I can't stand shimmer reverbs. I had a very short period when I liked them. Skylar is not that bad at doing this. it's not over the top, doesn't make me feel sick. Even as not a shimmer reverb fan, I'm using it from time to time because it's gentle enough. Descendant shimmer is nice but I'm yet to find usage for it.
Plate mode:
I don't really use it. Not because it's bad or anything. No, it's actually very pleasant sounding. It's very nice but I have Spatium mode which I prefer more.
Tremble mode:
I like it as much as I like Spatium mode. Not a type of reverb that I'm using often thought.
Overall, it's my favourite reverb ever. I like it more than any plugin that I collected over the years. It has something special that I can't hear in the plugin realm. This pleasant, heavenly sound is simply gorgeous.
I'm highly recommending this pedal. I was choosing between this one and Hall of Fame 2. I'm glad that I chose Skylar.
Any complaints? Not really. Just that this pedal forced me to buy a good power supply (1Spot Pro CS7) because otherwise when chained with other pedals it was making lots of noise (due to its digital nature). 1Spot solved that issue completely.
