I wish the corners were rounded as they do tend to irritate my hand as they are somewhat sharp and pointed

I used the ipod primarily for running and as my hands would get sweaty and I would try to scroll and the ipod would not respond

I suppose the only con for me would be that the scroll is a little difficult for me to use (though I have hyperhydrosis, meaning my hands get sweaty often.)

I have small feminine hands, so it's not like my fingers were to big and bulky to scroll using the little wheal

Advice - buy as big as you can afford.