I LOVE THE BACK BUTTONS, they are so convenient.
I think the V20 has side buttons but now I can't remember lool. I'll blame that on the time of night and the fact that I'm sick. But yeah, I really think side buttons, now that I'm not using a phone that has them, are cumbersome. I'd always hit one by accident or hit the wrong one when I would be meaning to hit a different one... It would be nice if LG implemented the back buttons into its hardware.
V20 has side buttons