Instruct: Classify a given Amazon review as either positive or negative.
Query: Best Trackball or Mouse Currently Available

While I prefer the older, flatter style Logitech Trackman Marble+, they no longer make those. This Trackman Wheel is the best currently available in my opinion. Comfort is fine for my medium sized male hands. Many people are either uncertain about using a trackball instead of a mouse or genuinely don't get how to use it, but I picked up on it within minutes and haven't looked back. I much prefer a mouse which sits in one place to one I need to dedicate a large swatch of desk space to move around. Also I'm not fond of trackpads I've used (too many false clicks) so physical buttons and trackball + scroll wheel are great for me.