>>23510551They aren't too bad because you can just turn them inside out and that makes them easy to thoroughly clean and dry, although lowers the lifespan a little.
They feel much better than western brands like fleshlight though which are much more stiff and don't feel nearly as good.
I do think the closed end doesn't help as much as they claim, the suction doesn't add much over opened ended ones but makes cleaning way harder for little reward. The only benefit I see is that because they're smaller, it helps keep your dick and cum contained since without the closed end you'd just thrust all the way through.