I did the MEI/II add-on at Long Beach. I opted for the 15 hr program instead of the min time one, and was glad I did. The cost difference between the min time program and the "up to 15 hr" program wasn't too bad, but it did give me enough time in the plane to get comfortable. I also found out after I got there, that 2.3 hrs of my training time had to be used to transit to & from the examiner since he wasn't at Long Beach.
My experience was about 1.5 hrs of ground on day 1, then 2 days of flying and 2 days of check rides. I went there to get my tickets (as I couldn't do them within 1000 miles of where I live) and that's exactly what I got an no more. As others have said, it's basically a program for well-prepared candidates. My CFI was a few months out of Embry Riddle with about 300 hrs given, and had never taken a pleasure flight in his life. He had the regs memorized and gave me all the gouge on the local DPE, including handing me a lesson plan I was supposed to copy in my own handwriting. But, there was very little depth in his knowledge base, as I found out when he tried to convince me that one of the reasons a twin has a left-turning tendency is because the accelerated slip-stream deflects to the right, and the left engine's strikes the rudder making the plane turn left. Huh?
In my experience, it was all about passing the check rides. There was very little instruction involved. My CFI was there to allow me to prep myself in a new airplane and endorse my logbook at the end. That's what I was after, and that's what I got.