I don't have a T-1, but upgraded to a 650 after being very happy with my 505 for a couple of years. And I can say without a doubt that the change was well worth the upgrade. For me, I love the easy dictionary access and the touch screen interface. And the clarity of the screen is of course another plus. I also like the fact that the 650 supports full justification, and doesn't display the page numbers in the right margin. (All these benefits would apply to the T-1 as well.) The T1 doesn't have a metallic case as you point out, but the plastic case has the advantage of being lighter.
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