The WriteRight offers a great way to protect the most valuable part of your Visor -- its screen.  The texture and reduced visibility take some getting used to, but are a fair trade-off for the protection you get.

Criteria  Rating Design 2 Protection 4 Usability 3 Cost/Benefit 3 Overall (not an average)	Pros - Reduces glare - No smudges
	Cons - Makes screen darker - Texture takes getting used to - Price a tad high