I've seen Femi 5 times. Three of them were great. The other two (including the last one at the 9:30 club about two years ago I would guess) were so-so.
At their best, the band really cooks and the energy is high. And Femi is really charismatic. At their worst, the performance is a bit lethargic and sloppy.
I will go. It's not a surefire great performance, but it could be.