Well, my impression so far, from what I've seen:
The Hammerhead CCR looks like a serious contender that could give the Meg a run for the money.
It has integrated deco, redundant if you want, and what looks like a nice scrubber.
Both items ISC has been promising for quite a while.
The Disco is a bit of a disappointment at least visually, and their marketing worries me.
The PRISM 2 at this stage is just a moded and pimped prototype based PRISM Topaz.
Too bad Hollis hadn't more to show. Basic loop has always been great on that rig, but unless we know how it's build there is no telling if there's the needed improvements.
Personally I like the Sentinel a lot. Nicely build, many of the Ouroboros features at more reasonable price tag. And I do have learned to appreciate backmounted lungs.
The rest I yet to catch up with.