I've had positive experiences
I have bought 2 cosplays from them (Gerudo Link and KDA Akali) Both had fast shipping and great customer service. Gerudo is kinda cheap costume fabric, but Akali is perfect and street wearable. There are sellers on other sites like Ali pretending to be MicCostumes so if you're not sure, e mail them directly to make sure where you're buying from is a recognized reseller.