5C/D seats on a 319/320 don't work for me, as my TravelPro rolling laptop case won't fit in the smaller aisle storage area under the row 4 seats. I foudn I want to sit in center (largest storage area) or window (smaller then center, but much larger then aisle). Something I never found out on seatguru. I could board early and stuff the bag in the overhead, but there's so much legroom I don't care about storing it under the seat in front of me, and I like to be able to reach down and grab things randomly from my bag (vs. getting up repeatedly, which upsets people when you're in a window seat!).

Steve B.