1) It can get quite chilly during January - take a jacket and wear long pants.
2) Especially for the second show.
3) The second show is actually canceled frequently due to cold.
4) As for seating, Cat-3 could easily have a pillar in your way.
5) You will probably have to turn around and crank your neck to see.
6) I do not do Cat-3 for Luau or HDDR.
NOTE: There is a reason why Cat-3 seats are Cat-3 and cheaper.