I echo Bose- X's views. I started my MEP with 180 hours on Cessnas and really struggled on a Seneca. After a few hours my instructor sensibly advised me to stop wasting money and get some hours on a complex plane, which is when I moved onto the arrow which helped tremendously.
At the risk of thread drift I do question the wisdom of getting a MEP rating unless you're going to be very current, losing an engine on take off needs sorting out very quickly.
LF