I tried the S9+
TBH, it's nice and it's obviously better in many ways, but I'm keeping the Note8.
Yes, the S9+ is faster, but my Note8 isn't slow by any means (both are on Exynos SoCs). If anything, in daily operations, I never felt "Oh boy, I need the S9 because it's that much faster". Yeah, in heavy tasks, the S9 wins with zero doubt, but in normal operations, the Note8 is no slouch. And I'm one of those people who uses the S Pen every day, so the S9 is not going to appeal to me personally.
The camera on the S9+ is also great but I've been using HDR+ on my Note8 and aside from noise, I preferred its output overall. I would expect the same out of the S9.
It is a really good phone and I'm happy that many others seem to enjoy using it, but me personally, I'm sticking with the Note8 for quite a while. It's a great phone and doesn't seem to be a rebel against what I want it to do.