Good, but not a Unieibe
I used an original Univibe for years until it finally could no longer be repaired - bought it new way back in 1972. It finally died back around 1995 and I've been looking for a replacement ever since. Don't get me wrong – this pedal has a nice sound, but regardless of the identical logo, the sound is different. Specifically, the virtual panning is based on a sine wave (overlapping sine waves that are slightly offset). The original did not use a sine wave, as the turn=around at both ends of the cycle was not instant, but dragged a little. Listen to Hendrix' long sustained notes in Machine Gun on the original Band of Gypys album. You can hear how it slams at the high end (this simulates the horn of a Leslie while the low end represents the spinning styrofoam cylinder placed over the woofer). My advice is that if you like the sound of the MXR Univibe, buy it and enjoy it, but if you want the genuine Hendrix tone, you'd have to find an original (and hope it still works).