They're sounding (and looking) good so far on my end. Nice variety and good choice of controls. I did have one weird case where I inserted the Jazz amp after trying the other Clean variations and had some static-y noise that wouldn't go away until I stopped/started the audio engine. But that didn't happen again. Perhaps it could be related to being prototypes? FWIW the Jazz sim does remind me of the Roland Jazz Chorus, which I do like.
Anyhow.. they all sound good here. Hard to tell whether they'll wind up as replacements for GR5 or Revalver 4, but I can already tell I'll be using delivered FX Chains more than ever before. So if this is an example of the "content" referred to as part of the new Membership program, then count me in!