Texture, glossy-plastic feel, size, two or three bulky protruding buttons in between your keyboard and the pad, and being very distinctly sub par in regard to m

Texture, glossy-plastic feel, size, two or three bulky protruding buttons in between your keyboard and the pad, and being very distinctly sub par in regard to multi touch functions or detection (though OS integration seems to be the main factor). Size and an offet layout (some are unfriendly to lefties) relative to the rest of the case is a factor on most of their line as well.