They both use the same optical sensor. I have the Optical and it works great, especially if you have smallish hands, plus it has texturized so it wont slip out of your hand during fragfests. The Explorer may have more buttons; the Optical has 5.
ASUS Rampage III Formula Intel X58, Intel Core i7-930 @ 3.6, Patriot Viper II Sector 7 Edition 12GB, Galaxy Geforce GTX 680 SLI, LITE-ON Internal Blu-ray Burner 12X, Dell UltraSharp U2711 IPS-Panel Black 27" 6ms, Corsair Hydro Series H100, ENERMAX SGALAXY EVO EGX1250EWT, Corsair Obsidian 800D, Windows 7 x64
Alienware X-51, Core i3@3.3, 4 gb 1333, 1 TB WD, Evga Geforce 650ti
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