Worked here just fine.  The only thing that got me was the MYGROUP in all caps.  My fault for not reading the instructions closely enough.  I actually had to use it about 5 times because I was trying to flash my Bionic to cricket, screwed it up a few times and had to factory reset a few times.  Funny thing was when I did the factory reset before the successful flash I'd lose root.  After it was successfully flashed to Cricket I had to do a factory reset and the root held.  Thanks for the easiest root ever, I think this was even easier than the old GingerBreak exploit I used on my last phone, an Optimus C.