Holy moley this thing is amazing for butts! Size wise, your mileage will vary. I can see it being a little too much for beginners but not quite enough for size lovers. I'd like it just slightly girthier if they're coming out with a version 2 someday. The vibration modes are better than most vibrators, at maximum they'll literally vibrate enough through your legs that the floor will rumble also if you're standing up. But it also provides a nice low rumble on the lowest setting which can really shake things nicely. There are two other pulsing modes which are typical and very nice. But the magic here is the estim of course - three of the modes will vary the amount that you involuntarily clamp down on and in turn it feels like you've got a significant member inside you. Combined with the vibration it's better than any normal dildo. Some of you may wonder what that feels like anally - imagine the feeling of clamping down almost as hard as you can with a respectable sized dick in you, but without the mental effort to keep clamping. But there's still room for you to clamp down a little more on your own if you want to take it a little further. It's not painfaul in any way. Also on top of that it feels like pleasant zinging on the inside and if you pivot it around it'll seem to buzz different things, pretty great. I was expecting it would somehow just spark the prostate until it gave way and burst but it's not like that, it's mostly just stimulating the chute to cause it to tighten and the vibrations are what rattles everything else. The final two estim modes are even better! One is a pulsing of about every half second that is really good, just imagine involuntary clamping in quick spasms. But the final 'God mode' makes the electric current travel from the base to the tip every second or so which makes it feel like you're literally getting plowed by a well-hung cock even though it's just staying still, it's so good. At first it's intense and almost too much but after a few moments it's like riding a bike... with a giant electric dick going in and out of you. Externally it's not of any interest at least to me, just feels like some minorly unpleasant zapping. Holding it in your hands and turning it on is not something you'd do more than once. Rubbing it on fleshy bits is sort of fruitless, but your mileage may vary. Minor criticism: The suction cup is very stiff so sometimes it unsticks to whatever you've stuck it to, but only on occasion thankfully. The remote will shut off every five or ten minutes (hard to tell how much time passes when all you can think about is what sort of wild feelings you've got going on inside you) and to reactivate it you need to hold down the remote "on" button for a few seconds and then it'll shut off the vibration and estim, but that's okay - you won't waste any time getting it back to the same settings in a hurry. Cleaning is easy and it seems to hold a charge for at least an hour of full-on vibration and estim which is probably more than most people want to handle. I haven't ran it out of batteries yet during any sessions so who knows how long it'll actually go for before the charge runs out. All in all if this thing ever dies I'm ordering another one the next minute. Highly recommend!!