I have not had problems with them, so I haven't tried anyone else, and thus can't really offer much of a comparison (it's the same deal with taobaospree, lol; was satisfied so never tried anyone else).
I will add, though, that unlike with taobao shopping services, this one is more automated; you have to know what you want to buy. They answer questions regarding their service, but they won't contact the stores with questions or translate item listings for you. It's a non-issue for me since the language is no barrier.
RIP CosRevo, Love Laugh, Sweety Pop, Cocosilver.