Sound — 10
I have an Epiphone SG and a Roland Cube, and sounds good with all of my built-in effects on the amp. The wah will sound very bad at high distortion, so if you're always going to be playing metal, go for the Zack Wilde signature or something of the like. I can only describe the sound one way on clean, liquid. It's just great. It's adds flavor to any riff and will sound good on some low distortion. If you leave in the "toe" position you'll get supercharged distortion and on the "heel" position you get a weird synth-like sound.
Overall Impression — 10
It sounds great for clean and distortion up to about "7." I like to whip it out for solos, add flavor to riffs, even make some ambient sounds. I'd definitely buy it again, it's a little pricey, but that's what it's worth. This is the only pedal you actually need. I suggest getting an adapter with it, you'll go through nine-volts pretty quickly. You can get an adapter for One-Spot for about 20 bucks, that's the one that I use. It's durable and will stand up to anything, just don't go too crazy with your gain.
Reliability & Durability — 10
At first I was cautious of using it but pretty soon you'll be walking all over it, it just can't break. There's some goo inside, I guess it's lube for the action, but it'll get hair and shit stuck in there, just don't touch that. There's not much else to say, it's made of goddamn metal, you can't break throwing out a ten story building =P (maybe exaggerating, don't try)
Ease of Use — 9
It's so easy to get that classic sound in funk and rock that you always hear. At first I wasn't so sure about manually rocking it, but you get used to it almost immediately, it's just like tapping your foot. You'll Pick it up in a breeze with almost no learning curve. The manual was straight forward, there wasn't really much to say. Put your toe down and you get a treble boost, put your heel down and you get a bass boost, put 'em together and you get a "wah".