I have had good luck, in Boston, too. Kim is lovely and has called me a few times when she thinks I might like something that they just got in. Unfortunately, I'm only interested in one thing and they have yet to receive it. But I am always hopeful. DJ in Las Vegas and Kelly at SCP have been helpful and have sent items to me...always with a lovely note. There are great SA's out there...just have to hook up with the right ones. I also write notes, directly to the store manager, praising good service. Don't know if this helps, but it can't hurt. I figure everyone loves praise, especially when they sell high ticket items...all the time involved.
The only experience I have had is at SCP, too. There is an SA, Jasmine, who has been working for just about a month and she is lovely! I think it can help to have a green SA because they are looking to build relationships, as well. In any case, she seems like she is a nice person, overall: caring, prompt, gentle and genuinely excited for you when you find something amazing!