For small hands maybe ok, unusable for larger hands.

Video at Amazon.com See I got the Evoluent VM4RW today, 2 hours trying to find a comfortable hand position and will send them back.
If I take the mouse properly in the hand so that it is convenient, therefore, resting between his thumb and hand, sticking my finger tips almost the entire front phalanx on the mouse also. Likewise, when the heel of your hand, the index finger is resting on the mouse down up only half of the mouse.
But unfortunately did actually use the mouse to protect the tennis elbow, so is not possible to work.
When the hand can not lie to take advantage of the buttons cramped the yes even more.

I think that the mouse is not designed for Central Europeans.

The extent of my hand are also more likely to be regarded as normal:
If I take a ruler like a gun in his hand, so in the skin fold between thumb and hand using light pressure insertion of the thumb, the index finger from the base of the thumb is made 6cm long, about 11 cm long and the middle finger about 11.5 cm long , height of the hand when I share it with relaxed perpendicular to the table just 9cm. (Highest point measured hand back, not with your fingers)

Maybe you can help so the measurement of the hand to decide in advance whether what is for you.

I now stay with my Logitech Performance MX, which is at least large enough.