Sound — 7
I'm using the Grunge with a Maton into a Fender '76 Pro Reverb. The "grunge" (distortion) knob isn't going to give you every conceivable level of distortion; what it'll give you is everything from "rock" to "ROCK!". The level knob is only useful in a certain range. At its lowest it mutes everything, a bit higher than that compromises your sound like turning down the volume with the knob on your guitar, then the useful range goes from about 9 to 1 or 2 o'clock. I found that it sucked some treble and/or mid frequencies at settings higher than that, but this is a loud pedal and you shouldn't need it that high. It's the low and high tone knobs that really make this pedal. For what I paid for the pedal brand new, I couldn't have complained if there were no tone knobs and the natural tone was too muddy or screechy to be useable, but the Grunge's level of tonal control would be impressive on a pedal three times its price. One important caveat: this pedal will produce feedback with any useable settings. You should know straight away if this is a deal breaker for you.
Overall Impression — 7
This is more of a fun pedal for screwing around with than something I'd use for recording, although that isn't out of the question. It's good for hard rock (including, yes, "grunge"), metal, punk and hardcore and useable but not ideal for dirty blues. You can't really get milder distortion out of it, so it's not good for The Kinks, Stones etc. It's also only slightly fuzzy, so it's not what you'd want for Hendrix, Smashing Pumpkins or whatever. It'll probably do that raspy sound on the first Stooges album. The Grunge pedal is good enough to transcend its gimmicky name without being sensational. It's good if you're on a budget or if, like me, you collect pedals compulsively and are also willing to try out a cheap one.
Reliability & Durability — 7
It isn't built like a tank like a Boss or a Line 6 pedal, but it's too early to say how durable it is. It's pretty light. The pedal is painted to look as if it's cracked, but I haven't managed to put any real cracks in it yet. Then again it's only been a few hours.
Ease of Use — 8
It's pretty easy to use, and there's nothing you haven't seen if you're familiar with distortion pedals. "Loud" is level and "Grunge" is distortion - no surprises there. "Low" and "High" are bass and treble. Again, nothing tricky if you know your distortion pedals.