I got the 24x36 White Board/Calendar set a few months ago. I think these things are pretty cool and super convenient. Living in an apt, I don't want to nail anything or hang anything if I don't have to, so just being able to stick something to the wall is great.
The stickiness works well, yet somehow does no damage to my wall and like it says leaves absolutely no residue. It's more like a cling stick not a glue sticky thing. I was really impressed by this magic.
It would help to have a second hand help with placing it on the wall to ensure evenness and smooth out bubbles.
Also of note, it is practically a glove on the wall, so if your walls have bumps or just aren't very smooth, you will probably be a little annoyed writing on the surface.
The marker works and the little marker-holder which comes with adhesive to stick to the "board" is a nice addition.
I'll probably pick up the map set this time.