I know they've changed a lot over the years. I know mine is one of the more recent incarnations.
Damn son, it's such a flippin' unique and awesome sounding fuzz!
The gain range starts from open and light, all the way up to an end-of-the-world wall of delirium.
It stacks beautifully with ODs and driven amps. It loves to stack all across its gain range.
It doesn't sound like anything else, and is a perfect example of how Ryan insists on creation/innovation with his designs. He refuses to do the whole tweak-that-classic-circuit stuff.
It's just so, so, sooo satisfying to use.
Everyone in the world should own a Frazz Dazzler.