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It's really cool, until it uses 70% of your battery life in 4 hours.
I've been running it on my Exynos S21U for a year or two and I think the difference is negligible. I suspect it's because it only really kicks in when you're on the home screen, which usually isn't very long. Plus you can set pre-rendered wallpapers which also help. Highly recommended!
I've never seen it be responsible for more than ~4% total usage, and it's usually less than that. Always on display uses about twice that.
I took a more in-depth look at the stats and it's always ~18hrs of background CPU usage every day so I think it's accurate. I genuinely cannot tell the difference when it's off or on.