I saw the other M185 deal for $9 and a few people were asking if that included the prized Unifying Receiver, it doesn't but this one does. This appears to be the entry model with it and it's currently 48% off. Not an all-time low but considering the Unifying Receiver costs more than $18 on it's own, you're basically getting a receiver plus a free mouse.
Yes these, like the M185 are still a small mouse. I may relegate it to a travel mouse but considering I have big hands it'll more than likely become my daughter's mouse, I'm more interested in the Unifying Receiver.