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			I just got the cover with light for the PRS-300 yesterday.  It works okay and lights up the screen well enough to read by, but I think the light on the PRS-700 is brighter.  The light on the 700 comes from the sides so is annoying to some, but there are 4 small lights on each side.  The cover / light for the 300 and probably the 600 isn't as bright but you can move it around to where it seems best.  There are 2 LEDs with 2 settings (at least for the 300) and I'd probably stick with the high setting, although there really isn't that much difference between high and low. 
 
I only tried it for a little while in a dark bedroom last night, so it might be better.  The real test will be when I'm on an all nighter flight, which is when I really love my 700. 
 
Is it worth it?  I'm not sure.  Have to go on a night flight before I'm sure.  One thing about the 300 though - the largest font is still smaller than on the 700, so for old eyes, it takes brighter lights to read with.  Got the 300 because I like the size and the brighter screen. 
 
Hope this helps.  I'll post again if I find anything else.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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