Well, I really don't have too many pros and/or cons about the centrino because I personally don't use one. I have worked on many laptops that have had one and most of them were very light and the battery seemed to last forever. Most of the problems with these weree virus related so it had nothing to do with the processor....
But I can tell you one thing for sure....that the processor will out perform that Via C3 you have
Haven't seen one of those in a while!
Hope that was at least somewhat helpfull