I got this in one of the special bag bundles that OtonaJP sells, and it's not bad. The onahole comes with special lube that makes it slightly warm, and that's a really unique idea. I'll probably try out the cool version since I live in a country that is usually very hot. The heat is nothing crazy, but what do you expect, it's lube, it's not gonna just become hot randomly. I would probably not recommend people buying this as a starter onahole, since there are better alternatives at the similar price range.
It seems like a good deal, a G-project sleeve made with momochi material AND heat lube? Turns out, only an okay deal. The sleeve's material is truly nice, very soft and stretchy, warms up pretty quickly and retains it well. The problem is that it was so much smaller yet looser than I expected. I can use it well, but if you have a larger member you might want to look elsewhere. The textures are really not pronounced, so combined with the looseness and softness you really only end up feeling the central ridge and that's about it. There also seems to be a pocket of air at the end that doesn't like to go away even if you squish it for the vacuum. There was less lube than I expected, a small lotion-like container half-filled with the stuff. It's decent lube, but I couldn't notice too much of a warming effect. I've been using it about a month, it doesn't seem to have taken any damage, but the outside seems to get dirty and greyish somewhat easily, it'll pick up color easily. Overall, even with the price where it is I'd say it's almost overpriced, but considering the brand I'd say it's still okay priced.
I'd like to make a special mention to OtonaJP for their customer service, I had an issue and they helped work with me to resolve it quickly and sent a thank you gummy with my package. Keep up the good work!