Yeah, I like them, they added some serious speed to my rides.  I've fallen 4 times, but now I have this reaction whenever something is going on, I put tension on my leg and twist it all the way until I feel the clip stop me.  If I don't need to stop, I just start pedaling again, if something happens and I have to put my foot down my leg is 99% ready, just need a tiny movement and my foot is on the ground.  And of course, falling is no big deal.  2 of the times I fell I went all the way down to the pavement.  Didn't really hurt anything at all.