Update: this beer has been on sour cherries for 2 weeks. I wasn't really crazy about the base beer, probably because it wasn't all that tart. The sample I just pulled from the carboy tastes fantastic, I'm tempted to keg it now and skip the Brett addition! Gravity is 1.005, color is a nice pale pink. I may give it another week or two and keg it, my keezer has too many open taps...