This simple Demo product includes the Mesh Slender Male body with the "AV Grid" texture in No Modify/No Transfer format.
It's better than you think!
I'm currently using one of these bodies, I bought it around a year ago.
You really can't use this body with other mesh clothes, it requires from you to draw a texture with alpha areas in the places of intersection.
What do these bodies do? They basically provide a better shape for your avatar, they're good for costume sets with high level of body exposure (it's better when it's naked), they're good for improving your modding skills. My body now has an option for texture changing via chat or a dialog, it (in some versions) has some touch zones with different kinds of menus and actions.
As a conslusion I have to say that it's a great option for an engineer kind of person because it requires from you to work on it, and the results of such work can be great.
Can't find clothes that fit.
I tried this and the other shape and could not find any of my mesh clothes fitting it.