I got this along with the Small Wacom Tablet after reading the reviews saying that I absolutely needed it. Well, believe me, you don't. Firstly, the tiny battery only lasts a day so you will need to always have a usb cable trailing out of the back of your computer in anycase in order to charge it up each and every day. In most cases, I just leave the cable plugged in. I suppose that it is useful if you are in the habit of taking a laptop to your local Starbucks (unless you are boycotting them because they do not pay their taxes, so maybe your local Costa Coffee) and working with your laptop and a tablet (careful not to spill any coffee or muffin crumbs on the tablet) then I can see the point of this wireless accessory kit but it's rare that you would ever be sitting on a sofa and operating a computer running Photoshop for intricate retouching at 5 yards distance.
So.....useful, but far from a necessity. I will give it 3 stars because it works great and looks neat and is well made.......but it's fairly much asking you to spend money for nothing, as you'll still have that cable lying across your desk.