Which Versios do you have? Like em?
Melotus and Lacrima. When those two became available, that's when I got the second Versio unit so I could use them both
Melotus I think sounds great, but find it tricky to dial in what I want at times -- I think I just need to experiment and learn it better and take some notes. The feedback knob for instance -- if you turn it up only a little bit it seems to hold onto audio forever after the input goes silent, but that's at least partially because there's ducking as you turn it further to the right.
The way it behaves, I'm about 90% sure that, instead of a single buffer with multiple overlapping play heads (like Clouds/Beads, Morphagene etc.) it's like a Gatling gun of delay lines that get crossfaded in and out. It's definitely doing something a bit different though, otherwise I'd just stick to Beads.
One thing about Melotus is it has shimmer reverb-like octave up/down on its tone knob, and for once I don't hate it! It's really effective with some material.
Lacrima is surprisingly great. I thought I would have little use for an auto-wah in Eurorack but it has a lot of character, with the saturation and self-modulation, and that Juno-ish chorus. (I do wish the chorus didn't apply to the dry signal too, so I could mix it in a bit more subtly.) More often than not I have the envelope set near neutral so it's not auto-wahing at all.
Before those two, Electus used to be my favorite Versio firmware by a narrow margin. It's like the Desmodus reverb, but with clockable delays, less diffusion/more distinct repeats, more distortion and longer delay times.
Desmodus is a pretty great atmospheric/synthetic reverb (except for shimmer mode, which can just die). I have the plugin version, so I'm less inclined to use the firmware now, even though I think it sounds and behaves a little differently.
Ruina is another one that was great in Eurorack form but I think I like it more as a plugin. The distortion can get absolutely ridiculous, the real challenge is dialing it back so it's not overwhelming. Or you can use it immediately after a VCO and add some animation and shaping to it (which I guess is an argument in favor of the Eurorack firmware). The plugin works oddly well with my U-bass though.