Besides the price, what other feature(s) sets them apart? I haven't seen them in person yet so I can't tell if they're just shaped different or if there's more to it. What's justifying the ~$15 price difference????? 
Thanks!
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Yes, I'm talking about the Optical versions. I'm sorry I didn't make that clear. From what I can tell by the pictures, the explorer version is the bigger one, made to fit your hand better. But is there anything else different between the two optical ones? Or it just costs ~$15 to make it fit better in your hand. I currently have the Logitech (non-optical) mouseman which is the larger one, I like the fit and feel of it. I was trying to figure out if that's what the Explorer model is. Thanks!!!
Thanks!
*************************************************
Yes, I'm talking about the Optical versions. I'm sorry I didn't make that clear. From what I can tell by the pictures, the explorer version is the bigger one, made to fit your hand better. But is there anything else different between the two optical ones? Or it just costs ~$15 to make it fit better in your hand. I currently have the Logitech (non-optical) mouseman which is the larger one, I like the fit and feel of it. I was trying to figure out if that's what the Explorer model is. Thanks!!!