I ran IB on my DK last weekend with SimpleDK CC and I went from 70 to 80 in a weekend. I left it running for about 12 hours each day, maybe a little longer. I afk'd it most of the time while I was gone. I had no whispers and I topped the meter in EVERY run i was in. The only complaint is that it didnt roll on upgrades a lot of times. I just bought upgrades from the AH every few levels. You'll make enough gold in instances to do that. I set it to stand still while not in a dungeon and left him in ORG near a repair guy. Worked great for me. I used GB on my other DK, ArchBuddy on my pally, and griding on my Lock and hunter. All worked well but Im nervous about the grinding now. Hope this helped