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:
Although this trackman is not as good as the earlier three button model, it is still the best trackman on the market for my money. I cannot use the models that have the trackball in the center -- I have wrist problems that make fine manipulation with the fingers difficult. The same issues cause problems with moving my wrist and arm about to move the cursor.

Once you get used to using the thumbwheel, it is very hard to go back to using a regular mouse. The shape is very comfortable for hand support. And it's really funny to watch people try one for the first time, as they try to move the trackman like a mouse <g>.

The only flaw I've found is that after years of use, the contacts for the ball wear down, making the wheel drag. But since this happened after six years of daily use, I can't complain <g>. Oh, and if you drop it, the ball pops out too easily, but that also makes it easier to clean - it does collect crud under the ball. And if you are a lefty, you are out of luck.

I just hope that Logitech doesn't stop making this. They are the only company that makes a thumb wheel.

The wireless model is good, too, especially the newest one. I've just bought one, and am still breaking it in.

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