I like the angled sides but for some reason, I do not like the miter joints, especially with the angled corners.  I know there isn't much weight on top but I think it is because it just looks like it wants to slide apart, which bugs me.  Box joints or dovetails would or even just rabeted butt joints would look better to me.  The miter joints sort of bug me with the square joints too but not as much.  

$0.02

--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.