I've also just gone from CD to SW - my first WI this week I've actually gained 4lb, but I expected this due to recarbing. Hopefully this week I'll have a loss - the scales certainly seem to be moving downwards! I've never eaten so well, I feel fab!
SW is geared towards "normal" healthy eating, something I certainly didn't do before losing weight on CD. I felt I needed the discipline of still getting weighed each week now I've finished CD to make sure I wasn't slowly slipping back into my old ways, and putting the weight back on.
Good luck!