They sound stellar into a MIAB type pedal in front of either my Blues Jr or Hot Rod Deluxe.
One is rehoused into a Small Bear 125-B enclosure without a switch so it would fit better onto my main board with a switcher.
(purple box, upper-right)

One will be getting the full-on EJ FF treatment with TI BC183 & Fairchild BC183C transistors. I'll also be bringing the high-gain transistor collector bias trim pot out to an external knob for easy adjustment. I really like the idea of the big EJ silicon FF tone but with the options of a pre-gain bass roll-off Tweak knob. Kinda surprised you don't see something like this on more Fuzz boxes. Makes for a much more versatile Fuzz. I can't wait for my BC's to arrive to get started.

The 3rd I plan to keep stock except for the volume boost mod (R4, R5). Though...I have thought about installing a 2nd Tweak knob and adding another footswitch to allow easy selection of 2 different Tweak knob settings.

Has anyone else modded their Tweak Fuzz? Just looking for additional ideas.