Dry erase board markers smell toxic and awful. These are great, it actually makes my classroom smell good when I use them. The students notice. They sit closer to the board so they can smell the red cherry one. Unfortunately the pen life is short, so invest in the big box.
Update: I noticed these smudge up the board and do not erase well. It could be that my white board is getting older, although it doesn't happen with conventional markers.