I have used these since they came out and I swear by these!  I like the original magic eraser the best but either way they have gotten me out of a lot of jams.  It takes crayons off walls and wood (wooden art easel), a green shamrock spot on my cabinets that has sat there since St. Patrick's day.  Scuffs come off walls and it's just a nice little thing to keep around the house.  I especially love using it on my textured shower floor, gets the dirty foot prints of pretty good.

What prompted me to start using them again?  Over the holiday weekend we bought some nice new pictures and frames and hung them up.  As they were being hung, they also left nice black marks on the wall, so I bought a box and have gone to town on the walls.  The kids used to take hot wheel cars and run them on the walls and even those marks are gone.

To use the eraser you just wet it, ring out the excess water and rub the "sponge" in the area that needs to be cleaned.  There are a few times that it has not worked for me, when I bought my vacuum and while I was getting used to it, the handle hit the walls in a few places.  Just test to make sure that the paint or the wood doesn't stain or come off.  If your kids are as artistic as mine, you may need to buy a few boxes of these and keep them on hand.