Okay. Here is my review based on my own measurements, and having used this toy for over 6 months. 1. Material: The material is perfect. Extremely durable, and my partner says it feels exactly like it's my own penis when I'm inside her. 2. Getting it on: It is 100% imperative that you have lubrication, or it is simply not going to happen. If you have lube, and you are within the guide sizes I have written below, it will be easy. My measurements are: 7.25 inches length 4.75 inches girth (circumference) I bought this because I am very unhappy with my girth, and my partner hinted she would enjoy a toy that added some girth. Based upon my own penis size, this is a fantastic fit... My best guess of what size range could fit inside this, from lots of experience using, it would be: Length: 5.0 + inches Girth: 4.0 - 6.5 inches If I push the toy to the back of my shaft, I have about 1 full inch of shaft to spare, and then the head of my penis. For the man to enjoy it by sensation, I think it's important to be at least 6 inches in length, otherwise your head will be below the rim of the toy, and you won't be feeling too much. (BUT you can still get amazing enjoyment by making your partner have crazy amounts of orgasms, and seeing what appears to be you gigantic thick cock squeezing into her pussy, at least if you like that kind of thing like me). Even if you are considerably longer than 6 inches, I can't see it being a problem, because it stays in place locked around you ball sack by the loop at the bottom, and your partner will still massively benefit from the extra girth, One warning: The loop for your balls. I think I have quite small balls... and even with lube it is VERY difficult to get it on. I usually will lube my balls heavily, and put one ball in, pull it down a bit, then go for the other. If you have a large testicular sack, I imagine this being near impossible to get on. I have read on other website reviews of this toy, that because of the material, it's very easy to cut some of the loop away from the inside to make it fit, and I can definitely see that working, but just a heads up. It did, however, become easier with practice, as my technique to get it on became better. 3. Size of the toy: Length I have already discussed, but the girth advertised isn't quite true... I have a particularly thin penis, at 4.75" of girth, but once I have put this think around my cock, and measured its circumference, it is... wait for it... 8.5" around! Which is insane. My partner took one look at it and said "no way." I eventually got her drunk, and extremely turned on, then slipped it on, lubed the whole thing up, and slowly wiggled it inside her. It fit, and she is not what I would describe as loose. Women don't realise, but they can take a hell of a lot of girth when they are turned on, so I wouldn't worry too much about it not fitting your lady. She will undoubtedly be very shocked by its width, and is more than likely to experience discomfort and a little pain the first 3 - 4 times you try it, but it will be a pain/pleasure situation for her, where she feels amazing, like she never has before, but also with a little pain. By the 5th time, as long as she is fully warmed up, it won't be a problem. 4. Performance: It moves around a little during sex, so I think having that spare bit of shaft over the end (6.5+ inches length) is helpful, but regardless, it always remains on and comfortable, as it is held in place by the ring around your ball sack, and even during very rough sex, it never hurts at all. As far as the man's pleasure goes, if you are over 5.5 inches, you will have all the normal sensations, BUT the pleasure you get from hearing noises you've never heard her make before... and I mean that! And most notably, how quickly you can make her cum, it's incredible. Girth really is the real factor when it comes to penis size, I have to say. Because my partner cums so quickly compared to normal when I wear this, I can comfortably outlast her and make her cum between 7 and 9 times before I finish. Typically I can make her cum up to 7 times (she is one of the more easier to please partners I have had as she is quite tight), but it takes much longer and more effort trying to last longer for me. 5. Rating: Overall, my own opinion is that this is the best goddamn sex toy I have ever come within 100 yards of, and I have seen more than my fair share. It makes it easy to make her cum, you feel like a champion because of how huge you look looks going in and out of her, and the incredible pleasure moans you get in return, and seeing her occasions twitch and make sharp quick breaths trying to handle the damn thing... It is seriously awesome. In my partner's opinion, she absolutely loves the sex, but prefers another toy we have above this one, which is 7.5 inches in girth as opposed to 8.5 inches. I think it's primarily because she is worried that the gargantuan size of the girth she takes with me wearing this is stretching her and making her looser. She still, clearly, takes immense pleasure and numerable orgasms when I wear this thing. 5 Stars from me all the way.