I'm running my first pressurized fermentation in a cornie keg, pitched yeast to 3gal of ESB last night and the keg was showing pressure this morning. I roused the yeast and the pressure shot the the 7pai setppoint and began hissing out of the spunding valve. I intend to run the pressure to 15psi in a day or two. I didn't shorten the dip tube so I will have to pull a little of the beer before counter-pressure transferring to a clean keg.
This is my second pressurized ferm, the first was done on a large conical (Brewhemoth). It went quite well, typical FG, clean flavor and some free carbonation. Plus its pretty darned fast from pitch to pint.