I've honestly heard mixed reviews about them. Some say never to buy from them, others say that they're good, and still others warn "you get what you pay for". I think it would depend on what, exactly, you're looking for. If this is just a casual cosplay and you aren't planning to wear it a lot, then I'm sure it's a good deal. If it's something that you want to ensure lasts for a good, long time, you might want to go with someone else. I've never ordered from them personally, but as I said, I have seen mixed reviews.
This is the kind of reason I ask. I run into the same issue in the realm of firearm accessories, so my assumption that it carried over into costuming was correct lol. For what I would use it with, I'm sure it would work just fine, but I'd rather pay a little extra for higher quality and more presentable materials. Hence I spent hundreds on an ultrasaber