The best review of it I've seen is by Dom Sigalas. Sanjay C's is useful, but not as comprehensive. My first impressions after just a few days are that it's a very nicely-built unit with a fabulous display. The suite of plugins that it comes with are good, though perhaps not as comprehensive as you might like, but the main benefit of the unit is fast workflow while 'in the zone'. It won't replace the detailed work that you might do ITB when finishing a track - though it can achieve all of that if you have the requisite Softube plugins - but as a rapid 'sweetener' it's unmatched. It will become a lot more useful if Softube add compatibility with other brands' plugins - as they've started to do with their Console 1 - but so far I think it's great. If they did extend its compatibility it might arguably compete with the CS12 more directly, but for now the CS12 is uniquely good at its job.
As an aside, it sits very nicely next to my P-1 Nano on my rig in my house and those two units together almost remove any need to use the keyboard and mouse or even look at the big screen. I'm still going for the CS12 for my studio rig, but I might add another Studio Flow for that too!