well, i'll just start with things that i've tested.
i played music during my entire school day and the zune HD used half of the battery.
wifi is a pain in the ass. they bar has to be at least halfway filled.
video syncs on pretty quick (faster than the old zune probably).
the screen is viewable at like any angle, and it's really nice.
the touch screen is pretty good and responsive.
the thickness of it compared to the old zune is loving amazing, i hated having a brick in my pocket.
it doesn't have a hold button, it just locks automatically after a minute (you can only change this to like 1 - 3 mins)
the button on the side is for volume control and skipping through songs which can be pressed while it's locked or idle.
that button is kind of hard to press, though.
you probably got your zune by now anyway, but hope that helps
