I have lost 4.5 lbs on my first week doing Core! I have done WW before (always Flex,though), so I know there's always a big whoosh at the beginning, but that doesn't make it any less exciting. I'm hoping to get a good head start on the holidays because I know I'll have some trouble when Thanksgiving and Christmas roll around. Additionally I'm going to Vegas for a long weekend in December, which I'm sure will present some challenges.
Hope everyone else is doing well on Core!