Good mouse but has not held me!

This mouse was really not bad I thought, sensitivity is nickel, aesthetics is neat with its matte coating that will delight the most manic of us the opportunity to spend wireframe is convenient especially that first default, batteries not last very long. In 10 days, I consumed the available batteries and a new set of batteries (I'm on the xD reserve). The small bag is offered with practice to put the mouse cable and although she could be a bigger hair. The 2nd defect is specific to each but I want to report, I find that the mouse is a bit small (replacing my Microsoft Wireless Mouse 5000 the difference is felt).
That is my feeling after 10j with this little field mouse! ;)

EDIT: The battery autonomy is really poor! Use wireless just when needed!
EDIT 2: Finally after 8 months of daily use, one perceives that the mouse is not more ergonomic (I do not know what to do with my little finger on the mouse suddenly during long sessions I have enough evil that should not happen). There are also problems connecting to the Razer Synapse software that appear (such as Bluetooth USB) which can hinder people using multiple profiles. But I tried everything (deleting drivers and then reinstall Synapse) but without success. By cons, what will make me ask for a refund is that the sensor goes crazy mine: it moves by itself and does the opposite of what I do at times!