Pros: 1Tb, quiet.

Cons: One was pretty much DOA - scandisk errors. Two others died about two years later within months of each other.

Overall Review: Bought three. I returned one right off the bat as it was bad. Two others died about two years later within months of each other. Amazing timing - just after warranty. Wish there were a better hard disk manufacturer. Hopefully my 3TB Seagate NAS drives are of better build quality!

Pros: Feels like the traditional old Microsoft Intellimouse Optical.

Cons: Mouse now phantom scrolls.

Overall Review: My older Microsoft Intellimouse Opticals worked for probably ten years before finally succumbing to double-clicks or no-clicks so I bought this to replace them. However, after not quite a year, it phantom scrolls or zooms out on maps which is getting quite annoying. Technically, MS doesn't make this mouse anymore, but the Chinese companies have apparently copied it. It feels the same, and the buttons still click firmly and decisively, but the phantom scrolls are becoming quite annoying. I just broke down and ordered a new MS mouse, the Microsoft 4YH-00005 Black 3 Buttons 1 x Wheel USB Wired Optical 800 dpi Mouse, for less than ten bucks. I hope it is good enough to match these old Intellimouses.