copypaste from trans people i know:
"gc2b has gone downhill so not them. underworks is alright. shapeshifters and spectrum outfitters are great, though uk based. for them is a recent one that friends have had a great time with."
apparently, about gc2b:
"Their quality has just been p poor in the past like, 2ish years? Like they don't bind evenly, they're constructed more poorly, the constriction is painful for some, etc."
and apparently spectrum binders' don't fit everyone? but someone else said they loved theirs, so
(if you want more info i can ask them, since this is just what i've seen them say)