I have nothing against tacking old songs onto the album. As I said, I love Sabaku no Yuki being there, and I don't really have any problem with Proof, I just find it weird that it's being released on this album while no vain, Proof's b-side, was on MELLSCOPE. I think it's weird they release a b-side on the first album, and then the a-side on the next album.
I'd like to hear how mirage sounds. There's a preview available on MELL's official site, but my sucky computer crashes whenever I try to watch it. :| But I've heard people say it's great.