I got picked up for STA-21 in 03' (nuke submariner/ELT) and graduated from Auburn in August 06'. Overall I liked the town/school/unit. Auburn has a good engineering school, hot chicks (fun to look at even if you're married) and Football/tailgating is awesome. As far as the unit OCs will be expected to attend drill in the afternoon with the mids twice a week. One day in uniform where you will be doing close order drill, i.e. marching, for about an hour and one day where you will be doing GMT related to whatever community you plan on going to or a Battalion PT. There is also company PT once a week, again usually in the afternoons. The marching kind of blows and it gets old quick but it could be worse. Every home football game 4 OCs will be required to lead the freshmen mids for a flag ceremony prior to kickoff. This is divided up amongst all but the senior OCs and usually means only one or two games a season. After your first semester or two you will probably be expected to hold some type of billet (Ops, Academics, Company CO/XO, etc) which can require a decent amount of time depending on the billet. There is an occasional all-hands weekend event like helping out with a JROTC field meet but these are infrequent enough to not be a big deal. Keep in mind that while my info is fairly recent things can change quickly if there is a new CO/XO around.
**OC's don't/didn't have to do freshman orientation