I know a number of people on the forum have these, and they are very highly regarded.
So I thought I’d put together a thread for opinions.
I picked one up during their birthday sale, took 3 or 4 weeks to ship (which they clearly state on the website).
I put mine together yesterday, probably a 4 or 5 hour build. I personally dislike dealing with point to point wiring, and especially with relatively hefty solid core wire but the instructions are exceptional, every length of wire to cut documented including how much to strip. It also includes test processes for the amp at various points. The build involves mains AC voltage and 170+V DC, so you need to be comfortable with that and I’d strongly recommend you get some soldering practice before attempting the build if your new to soldering.
It’s an OTL amp, so you’ll need a headphone that’s got a reasonably high impedance (>150 Ohms).
Initial impression of the amp is extremely positive, mines dead quiet and with HD6XX or my ZMF’s sounds really good. It lacks the speed of some of my other amps, but it’s by no means slow, and it’s just a really nice sound. It might be my favorite amp with the 6XX.
I ordered mine with the Speed Ball mod, but the instructions explicitly state to build the amp without the mod and verify everything works, so mine currently doesn’t have it installed yet, I’ll post additional impressions when I get a chance for some more extensive listening and after I install the speedball mod.