If you have the 4.7 and it cuts out at 87, you are not truely using this truck to it's full potential. Get the programmer, adjust the power, and feel the horses. I was on the 91 octane program and it blew me away. Even in a 4X4, I was amazing myself and any passengers who dared to ride.
Despite the long wait and the problems with sending back the programmer, it is one of my favorite mods for this truck.
On a side note, the rising gas prices have caused me to drop the programmer down to the 87 octane performance program and there is a difference between the two. I feel like I have cut the balls off of my truck, but I hope this is only temporary.