I've been installing SabayonLinux over and over last week, so I found some little anoyances.
Once I arrive to insert root password, and username info, if I press tab to move to next field from root first insert password field, I go to Username initial field instead of root second insert password.
This might lead to write root password in plain sight.
Computer name field is half hidden in my opinion. It's quite easy to skip this step. In text installation, it's asked in a separate screen.
No more quirks right now for this wonderful distro.