Enjoy. I've been on these same coilovers for the past 3 years. Daily driven with multiple Palomar cruises and a few trips to Willow Springs.
These are definitely quality coilovers that don't get enough recognition with in the 370z crowd.
I plan to do a longevity review as well and am considering the upgrade to the Swift Springs depending on the difference in ride and performance.
(Just waiting on the custom rear springs Swift is building for the Powertrix Coilovers)