I'm really enjoying it - the normal channel is good but the TMB channel is great, and sounds giant with my low tuned guitars. Very glad I decided to build this circuit.
I'm still thinking about a build for my brother's birthday, and am considering building another of these for him. I think it would suit his playing style, and he has requested purple tolex, so at least I know I can buy a pretty good pre-built box for it!
I also have tubes already, plus I bought extras of all the parts so lots of the small parts are on hand. I'll keep thinking about it though so if anyone has ideas for something else worth building, feel free to make suggestions. Ideally I'd like it to be a build where the faceplates and chassis are easily available - I don't mind making a cab, but I don't think I have the time or brain space to DIY the entirety of the build.