I had to replace my 505 a couple of weeks ago after I damaged the screen.
To my surprise I have found the 300 even more pleasant to use because I can hold it and navigate with just the one hand - I found the 505 a little too heavy and wide to do this for any length of time.
I don't have a working screen on the 505 in order to compare contrast qualities but the 300 certainly seems no worse.
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