If these designs were worthwhile, you can rest ASSURED that companies like Noctua, Thermalright, Scythe, Silentium, Cryorig, Phanteks and other top notch brands would not only have them but they'd be available everywhere by now. Plus there'd AT LEAST be major reviews of them, even IF the potential production costs caused them to not be feasible. There isn't, so they aren't. Barring incremental improvements in EXISTING cooler designs through better designed chambers, fin stacks and surface area improvements, the only way air cooling is going to get any better than it currently is is with the addition of active phase change refrigeration designs.