Delta Air Lines Boeing B737 900ER (739) seat review by William Corfield #32538

As with a lot of airlines, passenger comfort in economy is 'you get what you pay for.' I'm not tall, so leg room was adequate, but cramped for a taller person. Seat width was similar, even somewhat narrow for me. Didn't use the recline as it's almost a useless feature.
The saving grace for Delta is that baggage is free, you can find decent fares if your not tied into a specific date, entertainment is good, and the staff is very friendly.