very well designed, relived of the stress in my wrist.
however i bought two of them and the first worked only about three minutes. the second one works already about a month. another good mouse seems to be 3M, but DXT is much better. the worse seems to be MXVertical. every mouse has to be raised up from time to time, when the edge of the area available for movements is reached. MXVertical is difficult to rise, although it's technical side is excellent.