I go to 3mA a lot and film videos there. I think you will be impressed. The room isn't optimal, but it's good enough to get a grasp on what they are capable of in a dedicated fully treated room.its an itch that wont go away. my wife and i are going to 3ma in Houston for an audition Feb 18. i am so intrigued by this non-traditional design. can they really be as good as Valin says... and my wife asked what if they are
One thing you may want to consider and discuss with them is the option of getting the Extremes without the $100k bass towers. I recently got the REL No 25, and I think a stack of those would be more than equal to the MBL stack at a significant cost savings. I think the guys at 3mA might agree with me, so it's something to ponder while there.
Good luck with the demo.