This pedal delivers a truly fantastic psychedelic 60's & 70's sound experience, with a musical throb and lots of "woosh", thanks to the photocell circuit used. Without any doubt the best Univibe you can buy at this price point!
Just keep two things in mind:
(1) you MUST use it with its own 9,6V adaptor (included) to sound at its best,
(2) it's certainly not tone-neutral: the 'chorus' setting definitely makes your tone brighter. No problem for me, as it prevents things from getting muddy or indistinct.
Forget about the MXR Uni-Vibe (more of a phaser, really) or digital simulations (TC Electronic, I'm looking at you!). The EHX Good Vibes is definitely the one you want!!! Authentic vintage tones in a box!
PS: btw, it also doubles as bloody fantastic boost(!) pedal! Try using it with Volume fully cranked, and Intensity/Speed at zero. Makes my Jazzmaster and clean Vox amp sound awesome!