I tried the Bamboo charcoal Konjac sponge. I like it because it's soft yet exfoliating, and my skin looks healthy and glowing after I use it. It doesn't work for removing makeup for me, so I use it after I remove my makeup but before applying night moisturiser.
It takes quite a while to fully dry, and I find that it broke down and needed replacing quite quickly. For that reason, I wouldn't repurchase.
I find this works well for cleansing skin, leaving it feel clean but not stripped of moisture. I don't find that there's much difference between expensive and cheaper Konjac sponges so I feel that all Konjac sponges would probably do the job.
They work well because it isn't too harsh on your skin but still gives a gentle exfoliation and clean. It manages to lift off light makeup too.
My only negative is that it gets mouldy fairly quickly despite hanging it to dry so look into replacing it more often!