Summary: I have an MXR Phase 90, but honestly, I like this pedal almost as much. The main problem I have with it is the switch is odd; it doesn't actually click on and off distinctly. The input and output jacks are plastic, and not metal as on the Phase 90. Other than this, the construction is solid. The PH9 is a more subtle effect than the Phase 90, so if you want something that has an extreme sloshing sound, this may not be the one for you.
Summary: A pretty good phaser with substancial detail. I like the on/off switch, nice and smooth. The true bypass is a good feature albeit uses up some volume. For the price it is a satisfactory pedal.
Summary: Sound just like a MXR Phase 90. Does not have a nice foot switch as you can't feel the switch engage (no click) you have to watch for the LED to come on or listen. Physically Not as strong as a MXR Phase90 (Don't buy this to gig with) but great for home studio use.
Summary: It does the job though. I wasn't impressed by the lack of range, but then again I've never found a use for the more extreme settings on a phaser anyways. It seems that this unit keeps the effect within a safe and comfortable range and that's okay with me.
Summary: I was actually surprised when I got this that it wasn't plastic like the other Behringer pedals I have purchased. This one is cast aluminum I think. It definitely has the classic analog stomp box feel. I don't use this much because I am more of a fan of overdrive, fuzz, and heavy distortion, but this thing can give you some "Pink-Floydie" sort of tones.
Summary: I bought this for a subtle phaser effect for a passive bass. That it does very well. If you're looking for a large degree of effect or lots of variety, look elsewhere. But, if you're looking for a very quiet "conservative" phaser I would highly recommend the Behringer PH9. It does change your tone slightly, but not nearly what I would have expected at this price. A very good introduction to what quality phasers can do.