It's a good phaser pedal. I really liked solos with prominent phaser mixed with distortion, delay and some reverb, like Van Halen's Eruption and, specially, some from Jeff Waters (Annihilator). I firstly discovered that sound in a presentation of his Annihilator V guitar and I was intrigued by it.
When I discovered that it was a phaser and tried to emulate it with a flanger, with moderate success, I searched for a good not expensive Phaser. The most used to get that sound was the MXR Phase 90, but it was too expensive for the few occasions in which I planned to use it. I decided to look to the EHx nano series, because I had an amazing experience with a Neo Mistress.
I found this one and the Bad Stone and, since I thought the rate control was everything I needed, I opted for this one.
I am happy with my purchase, I can use it to do the lead effect I was after, to make a creamy sound paired with a flanger or to inject live into a slow distorted part. But the minimalist controls makes it not very customizable, although very versatile, since the rate knob is really effective in going from annoyingly slow to furiously fast and the color switch makes the effect more pronounced if needed. The pedal sounds very good, although sometimes it feels to subtil with the color switch off and to intense with it turned on. Contrarily to what I read about other phasers, this one doesn't make picks or drops in volume along its sound wave, at least with a clean sound and before distortion, after distortion I really don't like the sound, not only of this pedal but phasers and flangers in general.
It is a very competent pedal, but it lacks some magic that, for instance, the Neo Mistress has despite being a miniaturized version of a more complex pedal. I wonder if the Bad Stone goes that extra step from good to great. The Small Stone, though very good, is a small step away from greatness.