Comment on 7zX

7zX seems to essentially be a Platypus wrapper around 7za, with a little GUI magic thrown in. The version of 7za that comes w/ 7zX is around 4.5, the current version is 9.04. If you do a lot of high-level compression of big files, I'd recommend building current version of 7za from source (http://sourceforge.net/projects/p7zip/files/) and dropping it in… 7z of ~2GB file takes me about 10 min less.