I ordered this mouse as a replacement for my desktop mouse which I lost. I need it for browsing, working, gaming, pretty much a bit of everything. Its optical, USB, 800DPI - everything it says in the description. It also arrived a day earlier than expected.
HOWEVER. Its much smaller than an average mouse, about half the size of any standard one. This makes grasping it quite awkward and clicking - especially when gaming - not particularly comfortable.
It would suit a netbook user or an eight year old but I wouldnt recommend it for everyday use by a normal sized person.