I'm in a dilemma.
Luna is stable and awesome fast on my hardware. It's based on 12.04 LTS and works perfectly.
Since then Linux Kernel and Intel gfx drivers is get worse and worse.
So Freya will be unusable on this hw because there are bugs in Ubuntu 14.04 and all kernel before 3.19 rc2. I don't think that Freya will support 3.19 kernel. But what is even worse is the current (theorethically bugfree) kernel and Intel gfx driver is much slower and unstable than in Luna. It's _literally_ unusable.
I'm using Luna on this hardware and it will stay as long as it's supported (April 2017).