Received the Invisible Shield screen protector last week. After discussing the product with Zagg (IS's distributor), we decided to "test" the product already on the market for the Kindle2.
I was not disappointed. Photos of the installed product appear at ...
I also received prototypes from NuShield. But we must have "mis-communicated." Their corners were "too" rounded. And the screen protectors were under-sized. Their screen protectors actually fit inbetween the screen and the frame - the prototypes received were way under-sized. NuShield has been contacted, and we'll try again late next week.
But IMHO, the protection offered by Zagg's Invisible Shield screen protectors cannot be beat.