I can only speak for version 6. I love this toy, it's easily my favorite. I have an R1 Cyclone that I used to use, but I was seriously amazed at how real this toy felt. The provided lubricant is a perfect match. I was cautious to purchase because of others claiming the inside was too rough or "sandpapery" but I that hasn't been the case with mine though I guess I could see it happening with a less viscous lubricant. Product is also very durable. completely satisfied with the purchase. Perfectly happy with my purchase.

This review is actually for the version 6. To get rid of that "sand paper" feeling the previous authors commented, You have to clean the product. It turns out there are salt like deposits in the item. You have to turn it inside out and start plucking out the salt-like things on the surface of the inside of the kashin. It took me a good half hour to clean the inside. Once cleaned, its par with the Maria Ozawa. Woo!

There was a sandpaper like texture on mine when the toy was brand new in the box. Using it without cleaning it was uncomfortable to me. The manufacturer says it's ok to turn it inside out, so I did, then scrubbed the inside with a wash cloth and liquid hand soap. I had to do that about 3-4 times altogether. Once the inside is smooth, it's fantastic. Although they are not similar internally, in regard to the quality of sensation, I'd place the Ch 6 on the same level as the Meiki Maria Ozawa. Perhaps even better if you consider other factors.

Just ok, not worth the money. As the state in the description, it is a brand new product, and it can use some work. However the material itself is very nice.

Product is very durable, not much odor and soft to the touch like a real person's skin. great quality. thanks

The material feels great, soft while seeming sturdy enough for repeated use, and with no noticeable odor as these products usually have. The inside shape is great too, very realistic-seeming.

However, there is also a very rough texture to the inside which makes it feel like sandpaper, no matter how much or what kind of lube you use. I haven't been able to identify the cause of this since it seems perfectly smooth turned inside out.

But that texture renders this toy entirely unpleasant to use. An incredible disappointment, especially at this price.

I cant speak for all versions , but I recently purchased and received version 6 . Upon testing it immediately upon penetrating i felt an unpleasant sensation of the nubs which are sharp and provide to much of a rough scratching sensation. I couldn't go on and had to stop. Unfortunately this toy will be going out with the garbage.

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I use this one for travel its small, the material is the best Ive seen hands down. Its just amazing, I would love to see this material used for a Meiki sytle product, it would be a huge hit. Its a bit more firm, but you can adjust the sensation with a thicker/thinner lube it actually makes a difference with this toy. YES you have to turn it inside out and scrub the residue from manufacturing off....its not even an option, u should be doing this anyway first use. I used a new dishwash scrub pad, and it took them off in 2 washes with some soap.
The sensations are intense, feels pretty good, not like a Maria YJY or NAO more tight and intense. Remember with all these products over time your dik adjusts to the sensations, one that feels loose and no sensation over a month will turn into the opposite....which you can use to your advantage with your partner.....if your a 2 pump chump get something intense, youll last longer in bed.
In my opinion this is a bit small for me, Im over 7" and its a bit tight if your low on girth this this would rock ya IMO.
With that said its still a great buy....the material alone is worth the buy just to experience it, there is zero odor to it and I have no doubt this will last for years without breaking down or ripping. My 2 cents.
Oh ya and it comes with a case which is a nice touch.....the lube sucks though, get the love potion stuff....; )

damn! that´s one hell of a masturbator!!!! you really have to clean the inside from scrubbing sands. but when it´s clean it softly sucks on your penis and licks with its unique cervix-structure. edging is easy and orgasm comes slow and sure in soft waves that blow your mind... i really love it!
the material is without a doubt awsome!
this masturbator is a musthave!