Very smooth install. Created the USB stick on a 10.8.4 rMBP, booted it, installed, launched MLPostFactor, rebooted, done.
Only thing I noticed different about the process was that the install says that it succeeded (it used to say it failed) and starts counting down for a reboot. Launched MLPostFactor from the menubar before the counter expired, it did its thing, then went back to finish the reboot. Screen went blank (with just movable pointer), had to kill the power (waited about 5 min before I did), but booted back into the system just fine.
One thing to note is that I forgot to format my running v0.2.2 10.8.3 OS partition before I installed v0.3 10.8.4 over the top of it. Seems to be ok, so far.
Video seems just fine. No issues with scrolling in Facebook (had that with previous install, but just fine now). Camera is smooth. iTunes picked up the AppleTV for playback. Finder sees the Time Capsule and mounts it right up.
Software update updated Aperture, iTunes, couple apps, no problem. All run quickly and smoothly.
Couldn't ask for more. Amazing work.
Edit:
Bluetooth is closer, but still has issues. I can see the device and attempt to pair, but it stalls out at 'Gathering info' for the device. Tried with an iPhone 5 and a BT Headset. That's progress at least! Before, if I recall, I couldn't even see devices.
Edit2:
SMB Client seems to be an mismatch between the kernel API and the mount_smbfs utilities. Force loading smbfs kext and using a 10.6 mount_smbfs starts giving some different errors than the broken pipe you get on 10.8.4's mount_smbfs. Unfortunately, I don't have the version that matches the kernel handy (or even a 10.7 version) to prove that out though.