We've actually been during both date ranges!
In 2011, we went 9/24-10/1. Extremely HOT and humid. We were on the dining plan but found it difficult to eat (and want to eat) large meals because the heat just took so much out of us. Between getting up early, walking around the parks all day, and the heat - we were absolutely exhausted. After this trip, we said we'd never do a "hot" time of year at WDW again. We also found there to be a lot of refurbishments since it's considered low season. The advantages, however, were that daylight was long this time of year, which people don't usually think about, but it made for longer park hours. There were also very low crowds. We also thought
MNSSHP was fun. As far as F&W, we caught the start of it during our 2011 trip although it's starting earlier this year. Be strategic about Epcot and you'll be fine - we only noticed the uptick in crowds here on the weekend nights we were there.
Last year, we went 11/14-11/22. Temperature-wise was much more tolerable - mostly low 80s but we did experience intermittent rain throughout the week. It wasn't the standard summer downpour, it was the cloudy all day drizzly type of rain that was just a downer. Between the rain and some days being in the 70s, we did not get much pool time in. Some days we wore hoodies too. Advantages were low crowds, not many refurbs since they were gearing up for the Thanksgiving crowds, and most (if not all) of the Christmas decorations were up. Although we did not care much for
MVMCP.
Between the two times, we'd go in November again.