I actually took my first crack at a yeast starter for my barley wine. I built it up twice (using 2c. of water and 1/2c. of DME) each time. Started it on Wednesday, brewed on Sunday.
All I can say is it was VERY effective. I had fermentation starting in under 12 hours. However, the fermentation was crazy strong. So much so that my airlock must have gotten plugged and the carboy pressurized while I was at work. By the time I got home, I was cleaning wort off my ceiling. Yes, the ceiling.
I can only imagine it must have went off like a champagne cork sometime during the day. I switched to a blowoff tube and am hoping for the best. The next time I use a starter, I think I'm going straight to the blowoff tube for the primary ferment.