What I like:
I use all-in-one sidebar and this theme goes all the way down the page instead of just a quarter;
It is a subtle change that looks quite nice, and even the grey isn't too light (which is good because of how the min/max/close buttons are on my linux laptop).
Even though not solid black, it's a good dark theme; I also prefer it's simple solid texture as opposed to some of the carbon and other textures out there.
What I don't like: ...I'm not really sure, my previous theme was a solid black, but I think this is a good substitution that I do not regret. I also put it on my Windows desktop machine