Great fun item,
This review is from: Speedlink Funny Farm Mouse USB - Cat (Accessory)
Bought as a birthday present for me (my 50th - and ideal for a cat-loving eccentric adult), this is great fun and has attracted a lot of attention at work (I work in a school)!
It is the size of a conventional mouse and is very responsive.
I have had no problems at all with it and it has already received a lot of use!
Perhaps not ideal for a very small child, but it certainly is fine for an adult/older child's hand.