This thing sent my knees up when I came

I got this for my 267 month old baby and he loves playing with it, he also uses it to smack me and jerk off, he moans super loud in his room and keeps me and his mother up all night long. We are happy he asked us to buy this for him as he was suffering from LDS blue balls. We cannot thank you enough Tenga!

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I think it is a good masturbator. Here's what I found in my use of it.
It has gentle stimulation. Fairly standard, but not a bad thing, great for edging.
With lube, this thing is SLIPPERY! You need to keep a good grip on it, but it is a nice, smooth experience once you get the hang of it.
Might give you cancer. There is a warning that says it may/does contain BPA, and that is a know carcinogen. Not good!
Also good for big dicks, as it's nice, stretchy, soft, and bigger than it seems. (For context, I'm 6.8 inches, and 2 inches girth/5.8 inches circumference.)

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Great for jerking off or holding it under a pillow or something and humping it. I've bought several of these and they're great. With a proper seal for suction, I've had some better climaxes with these than with real women.

Only con (and this is just physics, not a design flaw imo) is that if you manage to slip out during use, it can be really difficult to re-insert now that your member is all lubed up. So hold it tight ;)