Just found out a slight manufacturing flaw. The speaker grill on the bottom is slightly elevated to the left of the device & my thumb is finding it a bit weird. Not sure if I can live with it or if I'm going back to 3 to get it exchanged.
This is pretty much the issue I was describing above. It's accentuated by the fact the top grille is so perfectly flush it feels really wonderful in your hand. It's therefore doubly dissapointing when you find the bottom one is different.