I was already saving up to buy these when Hib put in his great review. I did buy them and put them in. Like he said, piece of cake. 15-20 minutes. As for the rapid blink, I'd have to say "yes and no" for me. The ones on the right side blink at a normal rate. The ones on the left usually (not always) blink at a normal rate until I put the brake on. Once the brake is applied, they do the fast blink. Let off the brake, they usually go back to normal mode. Again, only see this on the left side. Right sides behave normally. I've taken them out and put them back in with no change. Planning on swapping the left ones out with each other and see if that helps.
But, even still, I do like these things.