I cast on 64 stitches on size 1 needles for the medium size listed in the pattern and didn't do any gauge swatching since that's a pretty standard stitch count/needle size for me. I knit all the way down past the gusset with only minor problems (missing a YO or a decrease here and there, etc.), only to discover the sock is very, very tight. I can just barely squeeze it onto my foot.
The socks will turn out too snug for most adults, so I'll have to frog the project. It's sad to figure this out after I've sunk so much time into this sock. It'll take a bit more time to mentally prepare myself to rip it all out.
The fancy gusset and extended chain pattern down the length of the foot are new styles I haven't seen before. Maybe I'll attempt it in the larger size, since it's an interesting and fun (albeit intense) pattern. It's been nice having a small project that I can bring to work and do a few rows on each day during my lunch break.