Hey Walt,
I just switched from a 7100i to a 7520 as well. I like the 7520 SO much better. All around its simply a better phone. I do miss the dedicated send and end buttons though.
I wanted to add my 2 cents on your backlight problem. My solution was to install BBLight. It fixed the "lack" of backlight and suited my needs perfectly. You might want to check it out as well.
