It's not as insane as the other BJF fuzzes posted lately, but it's very solid and sounds great into a driven amp. Like
Anders says, it cleans up well and works as an OD - even a clean-ish boost!
The "working theory" pdf is a must read, and there's 20 page thread on the development:
https://bjornjuhl.com/forum/viewtopic.php-f=4&t=5432.html
Anders, can you describe the mods? I may make another.