The main problem that OCZ had was how to transport pressurised tanks across the ocean, from Taiwan/China to US and Europe.
While regular coolers have no problem being transported by boats or planes, a different set of regs apply to pressurised tanks, and with sub-zero cooling using nearly-identical concept as fridges, it would take a decent increase in manpower in every continent where the product is distributed to do a manual fill of each tank with gas, killing the once touted affordable price range.
After all, CryoZ was not supposed to be a mass volume product.
This once $199, later $299 product planned to shake up the market of sub-zero cooling systems and bring the price down to an affordable level, but problems with manufacturing were too great for the mass market.
So, if you're really high-geared to freeze your processor down, give Asetek's VapoChill a good look. OCZ is currently developing a high-performance hybrid water/air-cooling device which is slowly getting to market. µ