I was recently sent some spiffy new markers and labels to try out from ChalkOla, a brand I hadn't tried before. Henry and I were impressed with their vivid colors and have had lots of fun doodling on his white board and chalk board (two of the suggested surfaces for these markers, which have to be used on nonporous surfaces).
It takes a few minutes to get all of the markers primed, so if you plan on having impatient kiddos use them, I suggest you do that before you let the kids know you have them, like I wasn't smart enough to do.
You have to use a glass cleaner and a rag to clean off the surface when you're finished. A few of the lighter colors left stains behind on the chalkboard, but since ours already had acrylic paint permenantly decorating it, that wasn't a big deal for me.
As you can see, the color is extremely vivid, far brighter than most chalks or whiteboard markers. That makes them a lot more fun to play with, I think.
I've only used a few of the labels, but I like the way they look. You have to be careful not to smear them when they're wet though.
If you're interested in purchasing some for yourself, here are some limited-time codes that should give you a discount of 20 percent: 15 mm markers - CHK20OFF, and 6 mm pens - CHALK20A.
Event Pics: 2014 Kansas City Chalk Walk Festival
2013 KC Chalk Walk Festival (Event Pics)
Event Pics: KC Chalk Walk Festival (2012)