I had one, sold it, got another one arriving sometime this week.
It's a great muff clone and has a only reason I sold it was I sold everything around that time (idiot)
Difficult to really go into detail, it's a muff clone so it has that inherent vibe over say a fuzz face but that generally makes it better on bass, the low end retention is amazing and the mid control makes up for the short comings of a muff. When I decided I wanted a muff clone it was my first choice.
I can't comment to how close it is to a civil war era muff but I can say it's better than any of the ehx muff's I've tried.
I'll post more once it arrives and I refresh my memories of it.
I also have a Mojo Hand BMP-1 coming