I was a bit sceptical when I bought this mouse, as it really is a manx mouse, being wireless.
I did not understand this was a plus, not a minus. Two years later, I can say this is a really excellent mouse.

First up:
You have little dongle type device ( nano receiver)which you put into a USB port on your pc. I keep this to the right of my keyboard. I never remove it. This receiver allows the mouse to work. I am using it on a Dell laptop. Do remember though, you now have one less port, which might be annoying on some pcs.
The nano device has a tiny bit of software which you agree to, before starting.

Size

94mm long, 37mm high and 54mm wide tapering to 45mm . With the single AA cell 92gm
This fits my small hand rather nicely, I had a huge mouse before which gave me RSI.

Practicality

The mouse tracks well and is utterly responsive, which is good as I do not like using the mousepad on the laptop. It has red laser light underneath, an on and off button and a battery compartment situated there also.
I do not need to use a mousepad, just put it on the table.
I notice it does not like working on a light or shiny surface, so at my boyfriend's house, I sometimes put it on the black boxed DVD of the Matrix. Seems appropriate enough.
There is a scroll wheel atop which works just fine.

Reliability
I have used this for two years and only changed the battery twice. You can turn it off at night when you remember. I don't do gaming, so cannot say whether it is suitable for this.

Price

I paid 12.99 for this in Tesco- can't be bad, eh?

Overall, a pretty handy little Manx Mouse.
Still going strong, just changed battery again.
I have noticed I don't get any hand pain with this mouse, unlike my other one.