Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
Since my first computer in 1992 I have used a mouse and never really had any strong opinions about it.  I loved it for gaming, and it worked great for everything else.  After I started getting inner elbow pain which appeared to be from placing my hand in the same position as required by a mouse, I decided I would give using a trackball a shot to see if the pain went away.  Sure enough it did, and the comfort and ease of this trackball is certainly undeniable.  I am not saying your pain will go away, but I know it is a lot smoother and more comfortable to use this rather than a mouse.

And gamers, don't worry.  I am using a trackball for FPS games and it works just as well.  As one reviewer said, it takes a day or two to use, and then you just feel disappointed whenever you have to use a mouse.

I love this.  Buy a trackball.  The cordless is nice, it uses batteries quickly.  I am probably going to buy a wired one for work soon.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive