The one thing I was wondering about before I ordered this was where the vibrating mechanism is. Unfortunately the part that vibrates is in the bulb where you hold it, so not nearly enough vibration gets to where it needs to be. The vibrator just isn't strong enough to overcome the distance limitation. So once it's inserted, I really didn't feel much vibration. Half a star off for that. I was pleasantly surprised to find that it had pulsing patterns on it. That still didn't make up for the lack of power where it counts.I went with the large size, which is supposedly just a little bit bigger than a 20FR catheter. It felt more like a 24FR to me, but I didn't go grab my micrometer to measure it. Basically don't get the large unless you're sure. The smaller size (according to the listing) would be just shy of a 16FR which is a good all-around size. Unlike a catheter though, there are no eyelets to tear up your innards, so you can get away with a larger size then you otherwise would.The finish on this is that silky velvet-feeling finish that you see on a lot of toys these days. Be aware that it's not smooth like metal or plastic -- it does have some resistance to it. (Also it likely collects bacteria worse.) Personally I think the finish was a poor choice for its intended use, but it does give it a quality look/feel. If you're into this kind of thing and want the ultimate in smooth insertion, get yourself a Overall, it was made well. Vibrator is surprisingly good quality. I recently bought a different toy that vibrates and it arrived with the vibrator's wires cut and exposed and positioned just so they would repeatedly stab you in the glans. Much better than other sex toys I have bought in the past.The size seems accurate. The main issue I had was the finish. It is NOT smooth like metal rods. I had only ever used metal in the past. This one, at a glance, was smooth. Upon use, it became apparent very quickly that there is a bit of texture. Another reviewer called it a velvety texture which is accurate. Instead of gliding in effortlessly like a smooth metal rod, I had to apply pressure to it and kind of concentrate if that makes sense. I don't know if it does. Basically, instead of just relaxing and enjoying, it took a conscious effort to follow through with it. The texture also brings up sanitary questions. I don't know that I will feel comfortable using this again as intended because I don't know that I will ever really feel it is sanitized enough due to that texture. Bottom line, the texture on it accounts for the -1 star. If this were smooth, I would go back to 5. Overall not bad if you can handle or enjoy the texture. I personally would not get this item again in its current form.Works exactly like it should; no rough spots or other dangerous bits; frivolously easy to clean. I give it 3 stars because this is a VERY niche toy. It goes in places that are not used to such things...look, the nicest way I can put it is like this: Unless you are turned on by pain, I would not recommend buying this toy. This is not to say it's bad. I bought one and I like it, but it takes a special kind of person to be able to enjoy this. So, if you're super kinky, then this rating should read 5 stars for you. If you're just looking to experiment a little avoid this thing like the plague.I ordered the pink large it was a good size but the material used caused some resistance and we'll I broke it i am buying the smaller size hoping for a better fit there have a been a few people complaining that the vibration is to far away I disagree it's a urethral toy it's kind of difficult to get the motor in your dick... that being said great toy it vibrates nicely I would like to see a metal version come out the rubber is not as smooth as you would like it to be lube is key....I bought the larger size and could use one larger yet. This is not a stretching plug, but rather more like a fun plug with different modes of vibration available. Original battery didn't last long. Better to change the battery when any change in performance is noticed. Running on a weak battery can damage the vibrater.Can be used on other plugs by making physical contact with the plug and the vibrater.Possible to have an orgasm if you are into it.Needs lube for best results due to the grippy surface of the plug. Seems to be water resistant to water entering the battery compartment.Push the switch on the end of the plug to activate the vibrater and push it again repeatedly to change vibration speeds. Hold switch down and hold till vibrater turns off.The product is well made, but all the vibration stay in the top bulb. This is more frustrating than pleasurable and we just ended up using a separate vibe as one would when using a standard metal one.No issues with the quality, it is as described and arrived when expected. This is a good idea that needs some refinement. I would try version 2.0 if they engineer a solution.I agree with others about the texture as well. Feels nice and silky smooth, but does require ample lubrication.Only the head of it will vibrate. Not what I was hopping forHaven’t been able to use this product I tried just chickened out to get it in very far didn’t want to damage anything LOL