I had the rapid schedule Hep B in Dec 1997 and then the 12 month dose in Jan 1999. My antibody titer was so high even 10 years later that the blood bank used my plasma to make Hep B vaccine. So it definitely works. I had no side effects; a faint after the first one, but I had three or four other vax that day and hadn't had enough to eat.

If it's for travel, and you're in a big city, check out the Travellers Medical and Vaccination Centre (you can book online and they will call to confirm) They're cheaper because they buy their vax in bulk and they have specialist travel doctors. The website can also suggest a vaccination schedule for your trip.

Good luck!