The corporate world can be very fun and rewarding. I was fortunate enough to be managing a small, 1 jet operation at 26 in 1999. We flew to some reqular places, (TEB, PHL, BHM) but to many fun places as well, (Denver, San Juan to name a few). My partner and I would bring ski equipment along in winter and hiking gear in summer. Expense account and all benefits you could dream of. Problem was, the jet had 3 owners. Along 3qtr 2003, 2 of the owners decided they wanted out of the jet. Next thing I know, I have basically 1 month to shutdown the flight department and find a job to feed my family.
I have since migrated to the fractional world where there is a nice mix of both corporate flying and schedule. I miss the aspects of flying for one group of individuals and felling like I am making a contribution to that specific organization. I also enjoyed maintenance visits with the jet and beating the shops up over the bill.......but that is for a different thread.
My advice comming from 121 to 91 is be prepared to be flexible. You may be planning on attending the kids play at school, but if the boss calls, do tell him "Sorry, little Billy is playing a tree tonight and I can't go". I never did.....you go fly. The only time I knew I really had off was when gone on vacation. We didn't have many pop-ups, but when they happened, it was usually an emergency and as long as I was safe, comfortable and legal.....we went. We typically had a schedule 2 weeks in advance, but the pain in the butt guy would pop-up 2 days before. And he was always late! Drove some of my pilots crazy (me too on ocassion), but that is why your paid. You are on the boss' schedule.
Breaking into corporate can be tough. Network, network, network. In case you do not understand.....you need to network. When I shut everything down in 2003, I had been flying corporate for 7 years and had numerous contacts. Things were slow then, was offered a few crappy jobs in areas I did not want to live, so I decided to make the jump to the Fracs. I think I am gone more now (my wife argues differently) but I have a better quality of home time when here.
Hope this helps.....didn't mean to ramble. I love corporate flying and do not have any intentions of ever going 121. Although I would maybe leave for the a GOOD 91 gig, its hard to beat the job security at the fracs.