I use GalliumOS on a Dell ChromeBook 13 (i5/8GB). I don't have any issues except that the machine reboots itself during sleep sometimes. That's not a big deal for me, so I am very happy with the experience besides missing Ubuntu Unity after working on it for several years now.

EDIT: I used chrx to install it. I don't recall any issues during the process. I also upgraded the SSD to 256GB.