Yes, it is one of those modules you'll probably never want to sell - I won't for sure. ;)
The character of the basic reverb sounds like a well executed delay tank - not bad at all, though there may be better ("more expensive") sounding reverb algorithms available. But the unique, outstanding aspect of this module is the practically artifact-free CV-modulation of every parameter, which makes it so valuable in the modular context.
Clouds is very different, conceptually. I did not receive my unit yet, so I can't compare its reverb.