I've been thrashing about all day with my Jackson Dinky. Barking at the moon, waiting for 2 minutes to midnight before I tell the sandman to enter...;)
...and its great!!! What a superb pedal! I got the full-on Top Boost model after comparing it with the Micro Metal Muff in the shop.if you boost the mids you can get a great 90s rock tone (think Alice Cooper's Hey Stoopid album). All through a Valve Junior!
Guitarist magazine didn't really rate it and gave it 3.5 stars. Said the bass was too loose as I think they were expecting a Mesa in a box, given the Metal Muff tag. Imagine a Mesa with EL34s and that's the kind of tone you get. It does have its own sound though which colours things a bit, making the type of guitar you use less important. But then with scooped mids and plenty of gain and that's what happens with any pedal/amp.