I've had this plant for over a year now, and for the first, maybe nine or ten months that I had it, it did absolutely nothing. Which was depressing. Recently, it's really started to pump out the new growth, which is awesome, and then I noticed on May 14 that it was even offsetting. I mean, it's not exciting for what it is just yet, but for what it's going to be, I'm pretty stoked.
(PATSP profile on Sansevieria trifasciata: Link.)