I'm a recent i3 convert (been using it full time for the better part of a year now). It's one of those little changes that really brought me a lot of satisfaction.
This is on my primary desktop (with a 4k display). I recommend it to anyone who's in a rut with their workflow (learn about all the mods, i3-gaps, etc.) - it takes about a day to properly customize and get used to, time well spent.