Well, I used to hate descending at speeds on my Rev-Xs as well - very shaky when braking over 30-35 mph when hitting a downhill turn for instance. I even went to the little stiffener thingies between the spokes which only marginally helped. I also cracked the front wheel were the spoke attached to the rim near the the little rivets while riding. I felt it fail and had no accident thank God - I went to the Hed3s after that, now the Zipps. I had no issues with the Hed3s (other than weight).

I forget about the much better machined braking surface of the 404s. vs. the 440s - that is a nice improvement as braking is super smooth (even better than my Reynolds Alta Race clinchers)

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Fatigue is biochemical, not biomechanical.
- Andrew Coggan, PhD

Don't know about what is written about rev x's being less aero than spokes, but I can tell you it is more aero by personal experience. I have ridden the same time trial on the same day with spinergy and spokie wheels, the spinergy is much faster. I do hope mine don't collapse as you say, though! I will say that I have had them for around 8 years now and despite 'chunks' of blade missing, they still work great...

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"mt evans in 2:07:33"