I've got the Bert/Ernie hack on a K:4034 D:4034 system, 120G Samsung drive (locked of course) this is what I find:
When I press the power button it SOMETIMES takes exactly 3 times to boot to EvoX. By that I mean I press power, I see the X - M$, the screen flashes, I see the X - M$, the screen flashes differently (wierd colors, screen out of center), it sits there for about 5 seconds, and finally I see the EvoX.
Also, SOMETIMES when I put a game in to the DVD player, it doesn't boot to it, but goes right to EvoX. I do this with the power off, put the disk in, power up.
Right now I am backing up my Halo using Pxx HDD Loader, the first time I tried HDD Loader didn't see anything in the drive.
My conclusion is that the exploit is extreamly buggy and in the alpha phase, use at your own risk.