3 years ago, when buying a Canon Digital Ixus 750 in Malaysia, they provided us a with a screen protector which has been great.
Bought the DuraSec for the new Canon Digital Ixus 870 IS and was a little disappointed. It is very slightly oversized so doesn't sit perfectly which is disappointing for something that is branded for the camera size. Also, despite carefully putting it on, bubbles appeared which were a little difficult to smooth out.
Having said that, none of this is noticeable when you're looking at the LCD so nothing to worry about. I would still always have LCD protection as you never know when that screen may get scratched!