I've used Nova for several years now. I did not load it on my S8 and don't currently plan to. I do have some annoyances. I'd like the pull down gesture to bring down notifications. I'm getting used to not using that, and I have it set up where fingerprint sensor swipe does it. Still getting used the the feature where the up or down swipe brings up the app drawer. I wish there was an option to turn that feature off.
Overall, I find it very modern looking. More modern than what I had been using on Nova. Though I'm sure I could have made my setup look better by this point.