Reserve is 10-11 guaranteed days off depending upon 30/31 day month. Call out is 2hrs. Pay on reserve is pretty good. Most of my months were around 65-80hrs block with between 95-110 hrs credit.
All of the above is subject to change with any new contract down the line. We're hoping to get a few more days off each month for reserves.
Don't know much about the 401K/B-fund yet. Maybe someone else can chime in about it.