Been using xbmc since it was xbmp on the old xbox - I love my htpcs and honestly think xbmc is far and away the best media centre solution about, oss or proprietary.
I've been running openelec for the past year or so, it's a great system. Exactly what I want for a htpc-only machine - A Stripped down, essentials only, LFS-style embedded system.
I'm a little confused though... "Turn any pc into a media machine in less than 15 minutes" ?? Assuming I've already got the 80MB ish release downloaded onto a desktop, I can have openelec transferred to a USB stick, installed to a mechanical disk and booted into xbmc on the same/another system in about 60seconds...
The upgrade system is fantastic, the sabnzbd addon suite is great and for a simpleton user like me it's nice to be able to actually have a 2 way communication with the devs.
It's sad, but these are by far my favourite oss projects, something I actually like (and get excited by) checking progress on a daily basis.