I have to say that my experience was about 3 years ago, but it was so bad that it's still worthy of a post this far after the fact. One of their managers who I negotiated my deal with told me that they would take care of paying off my existing G35 lease so I could get into a new G35. When I got a bill from Infiniti for the remaining payments on my old lease, I took it up with them and got the "that was our deal" BS. I was so abundantly clear about that when we negotiated, but didn't get it in writing. Lesson learned. It's guys like this that give car salesmen the reputation they enjoy.
What I will say is that I really, really liked my sales guy. If he worked at another dealer, I'd follow him there. It ticks me off though because all of the hard work he put in was single-handedly negated by this money-hungry manager.