It probably is. And I haven't ridden a Slayblade. I actually didn't ride the Turbo Dream with Harshmellow. I rode the model the year before without it.
You are spot on with turn initiation. I have found in every category, that you can find boards with quicker turn initiations than the Never Summer option. My favorite board of theirs is the Heritage, which I would consider buying, but the responsiveness is something that always holds me back. Ride a Jamie Lynn the next day, and compare. It's scary....