I'd say the majority of components for HSD/BC/Stance/Megan/D2/Ksport etc are coming out of the same taiwanese factories, difference being their R&D on matching particular sets to particular vehicles, and after sales support (including repairs/parts). Some of them seem to get the ride heights, damping rates, and spring rates pretty wrong......
Tein, Cusco, HKS etc will always have a better reputation due to their level of R&D and the fact that they've out-lasted many other brands that come and go. There's gotta be a reason for that.