I use i3 daily but every couple of months I switch over to Gnome (I have both installed). I appreciate the appearance of Gnome, but I get frustrated with it's handling of multiple displays (I dock the laptop at work and have two monitors). With i3, the windows stay on their virtual desktops and it's pretty seamless when I dock and un-dock.

That said, it's not very attractive. My partner thinks it's looks bizarre and I don't think I could slide my laptop over to, like, anyone and have them be productive.