Great airplanes! I've flown them several times. The only exit row seat I've ever sat in was 40D. It was a great seat, I think I could have sat there a long time. The only drawback is that it's a little noisier.
Part of the great experience was the great company that I sat near. Just friendly fellow passengers and flight attendants across from us. Seatguru.com lists row 40 as an excellent row.