Soooo much negativity...
Looks from the videos that it shows on a small section top right of one eye. The advantage of a HUD is that it can enhance the world outside, while you are still looking at the outside world. It means you don't have to look down into the cockpit to look at instruments - hence improving lookup.
With translucent screen placement top right only, it doesn't look like it can fully overlay the outside world - only provide some info top right, so it can't do "augmented reality" type things, which is what commercial / military HUDs do. It can only really provide additional info. So it couldn't put a circle round a plane in the middle of your vision which has been picked up on TCAS / FLARM etc (enhancing lookout) but it could provide a display of FLARM / PCAS / TCAS in the same way current machines do. It could show you your PLOG or a moving map - and so save you going "head in". It could display your speed / height.
I can see uses for it (or something similar), as long as limitations are known and you check that potential blind spot carefully. Bashing it blindly doesn't help anyone.