Ive seen the show twice - once in Bristol by myself and once in London with DH and DS5..
I think the show is very magical.. but I do have some reservations..and my son was defiitely bored in places...although other places he loved it! The flying sequence and magical sequence is just amazing.. but dont go expecting it to be like the movie.. (ive not seen the film, but others who have were disappointed that their favorite scenes were not in the show)
It depends on what age your children are as to whether I would take them to see Mary Poppins or the Lion King..
The lion king is more suitable for younger children.
Mary Poppins is not scary, its just a bit boring in places for some kids.. (well all the kids I know who have seen it!)
Any questions.. ask away!!!