I used x-plan three weeks ago for my ’06 HSE. However, it took my dealer about a year to come around to letting me use X on an HSE only. It is a 7/06 build that literally came off the truck the day I put my deposit down.
I have been gah gah over the RRS since they were first sniffed out in spy shots ohh so long ago and the only thing that kept me hanging in there was my ’03 Disco HSE and great forums such as this one.
By the way, I used X on the Disco purchase in '03 as well.