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It hasn't gone anywhere because of miraculous claims that don't relate to what he is selling. Poppet valves work just fine; the claims of cleaner combustion and whatnot really don't relate to poppet valves. Claiming higher compression ratios from replacing poppet valves? makes no sense; diesel engines with poppets run 22:1 compression ratios.
The only possibly significant benefit I can see is lower friction from the valvetrain. However the typical valvetrain doesn't have combustion forces pushing on moving parts; the poppet is stationary against the head during combustion. The rotating valve will have combustion pressure pushing on it, and therefore on the bearing system. A good, honest study between the two styles would be needed to see where the benefits (if any) are from this valvetrain.
It *could* be better than traditional heads, but he is selling it as a miracle worker, and it isn't. It would take a while to point out piece by piece why each of his claims are pointless.
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