Very good board but there is a gap between the wood and the surface, resulting in instability...
Not so useful unless you teach indoors....
I believe there is a better one than this, search more

It is much better than I expected for its price. I have it for personal use, but I use it daily and so far I am satisfied. As other reviews say, it does move a little if you press the surface at the corners, but overall it doesn't seem to create any problem. It comes with a small black marker, which writes perfectly fine and I use it often, but I also got my own to be sure (of course, it doesn't have any issues, you can use any whiteboard marker you want).