If you are planning to use this on a laptop with bluetooth, then I'd get a bluetooth mouse instead. The Nano-receivers are nice and small, but if you can avoid them altogether, then why not? I'm always fighting for USB ports on my laptop. Now that I have a bluetooth mouse, I have one more USB port. On my laptop, the following devices are all competing for the 3 USB ports: e-cigarette, phone charger, external hard drive(s), flash drive(s), digital camera, iPod, etc.
Also, the nano-receivers can get damaged if you are a bit clumsy with your laptop (like most people are), which means you have to replace the entire the mouse, as the nano-receiver is tied to a particular mouse in the hardware encoding.