I think the calendars are worth it if your kids like Lego. The builds are easy and quick. They can open a door before school and build something in minutes. It is a nice tradition and makes mornings more fun.
That is a great point I did not think of that before.
The Lego Friends advent calendar had little accessories and figures. My daughter loved it. It was not complicated but it was cute. She looked forward to it every day. It made December feel special.
I think the calendars are designed more for fun than for big builds. They are about the daily excitement. The final collection is nice but the real joy is opening each door. It is a good way to celebrate the season.
I bought one for myself and I enjoyed it. It was nostalgic to open a door each day. The builds were simple but charming. It reminded me of being a kid. I think adults can enjoy them too.