We loved going in February so much we're going again NEXT February.
Here are the main cons
1) Unpredictable weather, so you do have to bring clothes for all different seasons
2) There were a FEW things not open
3) If you are a beach or waterpark nut, you probably won't have prime weather for it - a little cool for swimming
Here are the Pros, in my opinion
1) Lowest precipitation of the year - it only rained 1x in the week we were there
2) Weather would be cool in the mornings, but typically by mid-day it was in the 60s, 70s, up to the 80s a few days!
3) NICE crowds - we walked onto most crowds. Got a little busy in mid-day but still very manageable
To us, the pros far outweigh the cons. We would have liked to hit the beaches, but weren't really that disappointed that we didn't have a great beach day (actually there was one or 2 decent beach days, but we had other things planned)
Watch the dates.....the prices and crowds will jump up right before President's Day Week (around the 16th). This year we went the 9th-16th and that was the week before PDW. Next year we are going Feb. 1-9 (staying an extra day this time!).