yeah I've got a lot of mileage on my crowers. The main reason why Ti retainers had a bad rap before is that many of them were not snap fit. This caused the retainer to spin on top of the spring and that's what caused many of the failures.
Since then, manufacturers have stepped up and ensured the retainer to fit snugly. I am a good example of blind luck as the crower ret. I used were supposed to be for their own spring, but when I had them installed, I noticed they actually "clicked" into place and were much tighter fit than OEM.
I did a 2400km trip (1200 one way) in about 8 hours - so you can imagine how fast I was going ....with a 4.785 final drive - the car was constantly in VTEC!