My mom had something similar and it worked really nice for about a week.
She ended up losing the phone - still had the clip attached to her purse handle, along with the battery cover, but no phone...
My DH has used something similar on his razr and now blackberry...it is called the cliphanger (they have a web site but I can't post URL's yet!) He really likes it and has had no problem. Just make sure you get a shield not the stick on kind.
