We have four of that era truck at work.... 1 tech, 2 sales guys, and our service manager. ALL deleted... we still stock two turbos for the 07-12 6.7's. It seems when things go sour with that system, they go big and they go expensive!! Key to delete is doing it before you have a problem. I think you'll find it's money well spent, especially if you are keeping the truck. You'll be able to extend your oil changes (saves you money) since you won't have regen events polluting your crankcase oil with fuel. You should also see a substantial MPG increase up there with the newer DEF equipped trucks.

I nearly bought an 11 last year with full intent of deleting it, but the price was high and after pulling my race trailer with it, I either have a pretty good tune in my 01, or that 11 was a dog!!

btw EFI Live Wire seems to have a pretty good package and support. H&S used to, but after getting their nuts squeezed by the EPA, they only sell now and if you have a prob good luck getting it resolved.