I use this now, but I also try to use it on some seriously old Dell laptops at my non-profit. Sadly, that means I must first install Ubuntu, vanilla. This means I then must login to Unity and install Gnome-Flashback.

Normally, this takes about 10 seconds on a modern machine. On these 10 year old Dells? Unity chugs... A task that should take me 5 minutes takes an hour because Unity lags so far behind the mouse and slows every single process on the machine to an absolute crawl.

I cussed out Canonical for this a few years ago when they asked me some survey questions. They wanted to know why Ubuntu was not more popular on the server. My answer was that Unity was such a crock of shit that no one wanted to go near damn thing, even if they were just going to make the machine into a headless server. It's that freakin' bad.