The mouse is really precise and sensitive. Also, the form factor of the bluetooth receiver is amazing, its so small that it does not stick out of your laptop, which is a big deal for me. Also it is not bulky leaving space for other USB devices, unlike many other. The battery life on this is awesome, i have been using it for a little over 6 months now and i didn't have to change the batteries yet, so that gives you an idea. The product is also really durable, as i dropped it a few times and except for a few minor scratches its perfectly fine.
Although the price is a little high compared to several cheap alternatives in the market, the reliability and smoothness it delivers is something that you won't be getting else where.