Boots quickly in VirtualBox...
Just tried it in VirtualBox with the vdi image on an SSD (and two virtual cores on my i7 plus 8GB RAM in the VM) and really does boot extremely quickly (3 seconds from Grub to graphical login).
Anaconda is still pointlessly shouty (lots of headings entirely in capitals for no good reason) and the custom disk partitioning is painful - no obvious option to use all remaining space on device for a partition. I ended up putting in a big size value and let it truncate it down, but that's not great. They're still annoyingly mixing size units (K, MB and GB all on the same screen) too :-(
Still no package size or description is displayed when the packages are being installed and the placement of the ever-changing banner during the package installs (at the bottom of the screen, leaving a lot of space above it) made it look like a rotating banner ad, which most people automatically tune out now. The banner should have been slap bang in the middle of the install screen (i.e. above the progress bar).
Am I the only one who actively dislikes those white/blue coloured multiple progress bars at the bottom of an otherwise black screen when Fedora boots (yes, the ones that tell you zero about what's going on)? You can press ESCAPE to get a textual boot, but if you're doing a (barely) "graphical" boot, I'm sure it couldn't take too much effort to produce a better booting screen.
When I first logged in, I got about a dozen file explorer windows open (this is a known bug that will be fixed, but it just looks sloppy, even for a beta). I also got an immediate SELinux balloon warning which is bad for a vanilla install, so I did the classic disabling of SELinux (though is there any GUI to do this?).
I do like the MATE Desktop in general though (it's good with Linux Mint 15 too) - refugees from Fedora 14/CentOS 6's GNOME 2 desktop will feel at home with MATE. I hope CentOS 7 comes with MATE, because without it, the GNOME 3 desktop experience is painful.