This is the Klone. It is just like 'That' Overdrive everyone wants and that people will shell-out a fortune for.
They are a great design and do sound amazing either in Overdrive or as a powerful boost. This one is housed in a very compact 1590B format. By design they are not true-bypass, and do have a very nice buffer, but I can build them true bypass also.
*In case anyone is interested, I prefer it true bypass with my rig.