Head writer at Leap Motion here, so take what I say with a grain of salt. But it's like night and day.
It's clearly a much more mature company now, so I'm genuinely curious even if I had reasons to give up on the original device.
A lot of these improvements were diminished when we went to VR -- new angles, complex backgrounds, different ambient lighting conditions. So we made the Orion software, which was an even bigger step up:
- lower latency
- longer range
- better and faster hand recognition
- vastly improved robustness to cluttered backgrounds and ambient light