I have dealt with them on the purchase of two e63s. I wouldn't call them sales people or even a dealership...I genuinely consider these guys to be my friends at this stage. Olek, Chris, Zach...they are standup guys, and just genuine car lovers. I have no affiliation to their business other than having two exceptional experiences with them. I still text with/occasionally drop in there just to say hi and checkout what's new around there. Olek spent countless hours texting and chatting with me finding the specific spec I wanted, and not only was he patient with me, he enjoyed doing it. My father was sick at the time, and to this day I still get a message from those guys every once in a while checking in to see how he is.
I personally vouch for these guys, and would be happy to chat more via PM if you wish. You won't find a better experience in purchasing a car.