Millions of parents use the elf-on-the-shelf to monitor behavior. It's easy to try to make sure your children behave, while some don't like making them behave only because they're being watched. If you choose to use the elf, you have to make sure the behaviors you're encouraging are healthy.
She writes:
For context, this year was the first time we would try the "elf on the shelf" with our kids. We have three kids, Lucas (9M), Andy (8M), and Claire (5F). Where Lucas and Andy are from our past relationships. However, Miles (my husband M37) has accepted Andy as his, and so did I (F35) with Lucas.
Every Christmas is special for Andy; his birthday is on Dec/24. His dad started a tradition where Santa would've consideration with him for being a "kid of Christmas." So he feels magical. I always try to give him that. Last year, I left "Santa Claus" footsteps and ate a carrot and "grass" he left for Rudolf. Stuff like that.