i have had gc2b binders throughout the years, and lately their quality has tanked. i bought a couple underworks recently, and first impression is that they're so much better in that respect. notable differences; underworks: -seams are somewhat itchy. heard this lessens with more washes -arm holes are higher, which imo is nice, prevents spillage. might pinch depending on anatomy -stiffer fabric -seems to be a bit warmer, but less sweaty? somehow? -more shoulder room GC2B: -softer stretchier fabric -more comfortable with longer wears -i've had stitching pop on several despite having the correct size -smaller shoulders, sometimes uncomfortably so if you're more broad