I normally sit in row 20 or 21 (exit rows) on the Md-80.
The seat map for the Md-80 I flew on Sunday showed the aircraft had MCE, so I decided to take a gamble with the A/B side of row 9.
I'm a pretty big guy and found the legroom in row 9 to be equal to that of row 20/21. I did get bumped more by people getting seated due to more fort traffic at row 9 versus rows 20 and 21.
Otherwise comfort level was equal to that of the exit row.
Normally the bulkhead of Y begins with row 7 on MD-80's.
On MD-80's with MCE the bulkhead of Y begins with row 8.