Has anyone used any of these screen protectors?

boxwave's ClearTouch

NuShield

PurpleMoo

PDAScreenProtectors.com

Strong Engineering

EB Case Screen Protector

http://www.visorvillage.com/hardware...-1-11-ce-.html

Boxwave's cleartouch is $13 for one protector! Most of the other ones, usually come two or more in a pack. Is Cleartouch really worth it? Is it that much better?

thanks.