>often review units may not get any review until release
That is such garbage and everybody who believes that is garbage too. They specifically sent out the dev models for others to review. People not only claim to make videos about it, they had it in their hands when doing size comparisons while talking about reviewing it.
Review copies are out there.

We should ask "if it is such hot shit right now, why are there no reviews at all and why does the only claim of them working better as/comparable to vive 3.0 even though they are smaller come from the company wanting to sell them to you?"