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Fairlt clear distinctions between the top-end air and top-end water, but phase-change doesn't pull that much of a lead over top-end water, and unless given a particularly good CPU, phase-change isn't always getting ahead of water (except on P4's - although I suspect that if the IHS's were removed that the results would be a lot closer there too). Add in the costs of buying and running a phase-change setup and it is pretty apparant that it is truly a brute-force solution with fairly minimal gains.
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Sort of agree here. Most of the phase change systems listed there are commercial units, which are basically the "kits" of the phase change world. They tend to be not as effective as many of the homemade units of comparable size for many of the same reasons dicussesd in this thread WRT to watercooling (style, compactness, cost as well as some new reasons like refrigerant choice). I think if you looked at homemade phase change units, you would see different results as many of these can do 20 or 30C colder for the same investment in power and often much less money.
If phase change is worth it or not is pretty debateable IMO. I'm currently very interested in it, but is a huge investment in time even compared to watercooling.