One thing I've noticed, now that I've had the case for several days, is that when placing the phone back into the holder I can get my t-shirt or jacket caught in the case as I'm slipping in the phone. It's different than a regular case that is enclosed on all sides into which one easily slips in a phone. Also, when talking and walking the protrusions on the case can catch onto things in the house which is somewhat annoying. However, until there is a much better case for an iPhone I'll stick with this one.
It's now 3 weeks later and the clip does not clip as tightly as it did when I first got the holder. I will be exchanging it for another one and see if I have better luck with it.