Well, better don‘t compare Pimax to your ordinary Western hardware company, that level of professionalism isn‘t there. And yes, they tend to overpromise - or better, they will likely collect the majority of announced specs under a hood, but there is a big chance that it will miss the kind of refinement & alignment to work seamlessly together.
On the plus side they do attempt to go where nobody else is going, and it depends how much polsih and sometimes actually failure of functioning of a feature you are willing to accept to get the features nobody else is offering.
Example: the current 8KX has a great FoV & resolution, but for some games it needs additional 30% computing power on top of the usual load, the IPD is very finicky and it‘s not a fit for everybody‘s eyes. Ah, and the optional eye-tracking module can be bought - but not many have ever gotten it work properly.
That‘s Pimax in a nutshell for you. Not vaporware, but not polished consumer products either. Think of it as an experimental prototypey hardware.