I've ordered from aliexpress a few times. Just cheap things like earnings, decorations (great for wedding decor), lingerie... It's cheap stuff that's why the price is so good. So I wouldn't order anything I expect to be better than dollar store quality. With that in mind I haven't been disappointed yet. Things take a while to come (like 6-8 weeks) but they've always shown up.
My advice is to not purchase anything very expensive on the site and to keep your expectations low. There's a reason the prices are so good.