I tried Costco and was referred to a dealership by my office. They called, I told them what I was looking for and told them I would do Costco or X-Plan; whatever would work best. They sent me a build sheet for a F-350 with errors. I sent corrections and requested a price quote. I even called. Crickets.
Move forward 5 months and I went to a Bronco reveal event at that dealer and parked my Velocity Blue Tremor right in front of the show room. It still has its CA paper plates on it. I walked in and asked where the Bronco event was and there was the Internet Manager I was talking to for the Tremor along with some other dealer people.
She commented nice Tremor blah blah blah, noticed it was new, and said I should have bought it from them. I told her I tried but she sent me bad information, and would not do a decent deal, so I got it for X-Plan somewhere else. I said bye and walked out to the Bronco event. On my way I passed by a Ranger Tremor in the show room and it was marked up $3,500.00.
I think after everything I went through the tough part is finding a good dealer that will honor either X-Plan or some other pricing plan. Several I spoke with just won't. Others mentioned similar sentiment above.