To me I dont think they are all they are cracked up to be. I purchased my truck with 92,000 miles and was very ibterested in the Oasis reort for it. Which I had a Ford Dealer print for me, but there was very little on it, it did tell me what recalls and TSB's were performed. I was interested in the general maintenance, which cannot be found.
Many times I believe these general maintenance items are performed by local shops which don't have any link to Ford and the "Oasis reports".
My truck has been very reliable since I purchased it, I have comitted to starting from scratch and doing or maybe redoing the general maintenance items as soon as I can afford to.
Sory so long winded, just my opinion.