Useful as live repair or installation media. Ah, good old Gentoo was always booting somehow, even when other distros failed. Probably due to ambitioned graphical installers, they all messed up on the ECS G320 (Via C3 and CLE266) but Gentoo just booted with plain text or a plain VESA console.
I might get it if I should really need it (emerging stuff live might be useful if you need some special package for repairs, if that is not on GRML) but Gentoo users are rarely excited about "releases" of Gentoo since we have rolling release all the time. Still a good demo for people who want to try out and see the current state of Gentoo or as a quite reliable live CD/DVD for whatever purpose you need a live Linux.