Cant say much about other people, but for now have an X5 with a limited availability interior color ordered by Life Quality Bay Ridge. Price negotiations were pretty easy.
Having a current BMW purchased from JMK serviced at Life Quality wasnt a problem for me ether. As of today, been at LQ Bay Ridge service twice, both times unscheduled visits, second time around was even able to get a rental for the day.

I will tell you my total buying experience once I actually pick up my X5, but as of now, I am very satisfied.

Additionally check out JMK, usually sales and service is very good, just didnt work out on pricing this time around, Service experiences were also great, but I am more in Brooklyn now, so easier to get to LQ.