We used my husband's employer's vpp pricing when we purchased our 2015 qx60 2 weeks ago. It made the price negotiations so easy and we got a much better deal than we were expecting to pay. We paid invoice price minus the rebate incentives, so we got the car for $2250 less than the invoice. And there was no back and forth negotiating. They said, "here's our best offer" and we said that we'd take it!
I used my VPP through my company and car is in my wifes name. We bought a 2014 demo with premium, pp, drivers assist and theater plus roof rail and illuminated kick plates MSRP 52890 - negotiated price with vpp $42863 - out the door price with tax and tags $46667 - car 3675 miles.
VPP pricing is designed to get you a good deal without having to haggle. If you have a good dealer, it should be the easiest car experience of your life. Do keep in mind that not all dealers will just throw out incentives though. Good luck!