Seems like it would be hard to read at a glance. Besides that, the power consumption from the LEDs will probably kill the battery pretty fast unless they only turn on when you press a button. Today's LEDs are orders of magnitude more efficient than those in LED watches of 30 years ago, but running them continuously will still kill a battery in days.
Although these seem like a gimmick, I do think old-school digital LED watches are cool.
They're still made, too.