Originally Posted by bongomania
I've always been under the impression they were just clones, a Tubescreamer and a FET boost with fancy packaging. No?
They are. On a German bassist bulletin board one guy posted clips comparing diferent overdrives: Link
It's just a Tube Screamer with a bass boost switch (probably this: Fat Mod - AMZ
). According to the owners in that bulletin board the bass loss is less obvious if you run it through a (half) stack.
The build quality is good, but they are expensive, even here in Germany.
//Edit: Also found this: http://soundcloud.com/bass-setalight/rodenberg-808b