I paid invoice. Do I think I got ripped off? NO. Why? Because I drove my car off the lot in early October. I've had a wonderful ~4 months enjoying my ride.
Would I pay invoice now? NO!
I hope that answers your questions without divulging additional information. Imagine you are using this to haggle price down? Good luck!
I paid a little less then x-plan, I ordered the car with no deposit. Then found the exactly ordered car in Delaware. DIB GT Premium 3.55 20" Foundry Enhanced Security Wheel Locks Voice Nav- 38,000 OTD. MSRP 44,000. The only thing I didn't get that I wanted was the spoiler delete. And I never joined EAA or MCA. I would just call cars/dealers that I was interested in and offer x-plan. Some balked but most were agreeable. I wound up walking from the ordered car because of the uncertainty of delivering in the time frame promised. So glad I did. The car is freaking awesome and I love driving it more every day.