Instruction: Assess the user's sentiment in the provided review and select the appropriate sentiment option from the list as the answer.

Input:
Ok, there's an optional star rating called "Not Working", what does that mean, exactly?  If I give it 5 stars, does that mean the product doesn't work and doesn't work really well?  What?

Anyway, I love this thing.  I've purchased at least 5 or 6, including 2 wireless ones.  The latest one I bought for my roommate who loves using it in part because he has neuropathy in both his hands and wrists, but it doesn't affect his thumb or his forefinger/middle finger, so this works great for him.

For me I just think once you get used to it, it's faster than a normal mouse.  Just a quick twitch of the thumb instead of having to move your entire arm/wrist/hand.  I've proven time and again at LAN parties that it gives me a noticeable edge.  I'm not that great at FPS games, but against those at my level, it definitely makes a difference.  I've tried switching to a normal mouse using Razer Diamondbacks and Copperheads, but neither really work as well for me.

You do have to pop out the ball and clean the 3 tiny rollers inside (use a needle or paperclip or pen head), once in a while, as dust collects in there.  The rollerballs are definitely more sensitive to grease/oil too.  If you eat at your computer a lot, this might not be for you.  With a normal mouse you can move it with your whole hand, so a little grease/oil won't stop you, but trying to push the rollerball around smoothly with grease/oil on your thumb is tricky.  Not a big deal for me since I'm careful about that sort of thing and I wash regularly.

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