Since this is such an informative thread, I'll add a bit too.
I've seen several complaints of noise with these, but the only noise mine have made so far in 5,000km is a few "twangs" after adjusting the spring preload and some creaking/cracking sounds from the front left after an alignment. I removed the wheel and found the top lower strut mount bolt was loose. Torqued it up and noise gone. Either the suspension shop guy didn't tighten it enough, or the bolt stretched. I did notice the powder coating had come loose under the nut. Maybe that contributed? Will check again soon.