Summary: This mouse combines precise tracking technology with a decent design. For the average user the mouse certainly isn’t revolutionary, but it’s a reasonable cost for a decent improvement in precision.
Pros: BlueTrack technology is more precise, nice design, easy button configuration, Mac OS X support
Cons: Not ambidextrous, no DPI stepping, large grip
Conclusion: As a mouse the Microsoft Explorer is your average mouse. It's comfortable, easy to use, but nothing out of the ordinary. The problem is, that while it works, and works well, the market for a mouse that works anywhere is so niche that you'll probably be able to count the times on one hand that you've complained about your mouse's trackability when away from a desk.
Pros: Really does work anywhere
Cons: Aside from the BlueTrack tech it is nothing special