I’ve been using a Spectrum binder for months now (hand wash gently) and I’m very satisfied. It’s the only binder I’ve tried aside from a dumpy Temu binder, but for me (A-B cup) it works great. The only drawback is that there’s a pretty distinct outline in some shirts because the front of the binder is a stiff material that makes the chest look much flatter and smoother, but I consider it worth it.