There are pros and cons to using titanium coated needles. Here is a link to an interesting thread about them:
http://forum.apqs.com/topic/39609-ne...e-or-titanium/
I do think whether they work well or not for someone depends on the particular machine setup and user. Skipped stitches are usually a timing issue. It may be that the titanium needles change your machine's timing just enough to get skipped stitched.