which is pretty measly considering that real watches last months
Yes, but how many of them have screens and radios? In that case 2 days is pretty damn good assuming the screen is always on. Might be nice to have one that supports motion-based charging (like my Seiko does) but you probably need some serious wrist action for enough charge!
Down the road I can see solar cells embedded in the screen being used to boost battery life.
Of all of the watches like this I've seen so far this looks by far the best. Still don't think I'll be getting one, though.