Hi I'm considering purchasing a brand new 15" MacBook Pro 2.6GHz, 16GB, 1TB, 750M which comes with Mavericks. A lot of the apps I use aren't yet comparable with Mavericks so I was wondering if anyone has tried a fresh format and downgrade install to Mountain Lion? I understand that Apple warn against installing older operating systems than the one that ships but I'm wondering if anyone has tried it. Does it work? Are there any issues? Any feedback would be great.