Every review of it I've seen has been raving about it...but its mostly team members and people affiliated with Dagger...so who knows how honest that is. They are certainly hitting Social Media hard with the marketing.
Rewind looks to have more bow volume and a semi-planning hull compared to the Braap. They have only done a final design on the Medium size right now, and the Small and Large will be out next spring last I heard. It looks quite fast and certainly capable of squirts and splats, but its hard to say if its as playful as the Party Braap. Its got a bunch of creek boat DNA in it, so it will probably take care of you in big water better. Looks like its great for tearing between eddies and catching fast waves.
I'd say it would probably replace most of what you use your RPM and Party Braap for, but its still a 9+ foot long "half slice" boat so in my estimation its not gonna replace the Chronic. If you are looking for a modern "full slice" maybe check out the Liquid Logic Homeslice or the Pyranha Jed (or...if you are EJ's size...maybe the Mixmaster).
I don't kayak much, but the Hype for the Rewind is really making me want to try one out. I'm a big guy, so I'll be waiting for the Large. I'm kinda interested in the Soul Waterman Funky Monkey too, despite it having a silly name. Better planing hull and a bit more length and but slicier. If I was a smaller guy, I'd probably have a Soul Waterman 303... a 10' long boat with an aggressive planning hull and slicy ends sounds like a ton of fun.