I am mostly a solo practitioner. With that in mind, a toy like this best serves me as an extension of an existing vibe or dildo. I find they work great to fatten up an average toy, increasing the girth to something better than the original had. It also enhances the length, though generally at a much diminished capacity. It is rather easy to snug down onto a dildo, and a little lube can help with this.

The material is plush and floppy. It is nice and stretchy to fit over a cock or toy as necessary, and it's both seamless and relatively smooth. There is some slight texture to the sleeve itself, at least on the exterior.

Overall the shape is well designed towards emulating a cock. There is nothing really unusual about it, and it works great going inside you. An average person with a 5" cock or larger could probably wear it easily. Those smaller than that may have trouble keeping it in place. There aren't any straps to go around your balls, so a smaller man would have to hold onto it continually during use. The only solid part of the extension is the cockhead, so all you can really get is an extra inch or so. The rest of the sleeve is hollow. If you can't fill it, it will be floppy and ultimately render the sleeve useless for its intended purpose.