Americans That have Moved North? Advice 4 those that might

Hey all,
Considering, infancy stages of considering here, a move to Canada from the USA.
For those that have done so, already. Any advice for those considering it?

What do you miss?
What did you not realize prior to the move?
What's the best thing since the move?
What one 'nugget' of wisdom you have gained do you wish someone had shared with you?

Thanks for all the help.
Rick