but once you get it they work great. Cleans easily off of an old chalkboard with ...
593632
Takes a while to start the chalk flow, but once you get it they work great. Cleans easily off of an old chalkboard with a wet rag.
3358357
They work great just a little hard to get use to but once you get the hang of it they are great would highly recommend them
4655133
I used these on a chalk board and they worked great. They look very bold one the board and they paint came out in a thick even coat. The down side is they don't go very far.
1005825
I bought these markers with the Kassa chalkboard vinyl decal. Just received them and prepped them (instructions come with the box to push, shake, and press drown to get the tips wet with the ink). They're bright and striking even though the chalkboard is a little gray-Ed out.

I was worried because the purple and red are quite dark, but once the ink dries, they're a lot brighter.
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UPDATE - a few weeks later

I'm a little unhappy for two reasons: (1) even with windex or chlorox wipes they don't clean up extremely well. They smudge and leave some residue. I really have to scrub them off. and more importantly (2) each time I leave the markers closed for a day or a few hours, I have to prep them again - push down and shake to get the ink out, otherwise they dry up and I can't use them. It's really frustrating to go through this everyday.
4055016
I wasn't sure how well these would work on a traditional chalkboard, but I love them!  They are nice and bright and remove cleanly with water.
2350973
When they work they work really well but it is hard to peel them evenly from the role to get a clean sheet
2500114
A bit of time needed to learn how to get various results, but then you have a great little device. It is very easy to clean.
4264375
They work so well! Beautiful, vivid color. I didn't read the warning to test in an inconspicuous place first...Just wrote a note to my daughter on the chalkboard that hangs on our front door. I guess that chalkboard is porous, so it absorbed the liquid chalk...And won't come off, even with a gentle spray cleaner I use in my kitchen.

I just received an email from Crafty Crocs with a user's guide which recommends trying Windex it something like it...or a magic eraser. I'll try those and see.

My guess is if I had used it on a real chalkboard, not a cheap, decorative type, it would be fine.
544170
My daughter LOVES these. They work great on our chalkboard. They wipe clean with a damp rag.
4932188
Once you get the hang of it - WOW it works great
533831
Hard to get on and take off, as well as hard to clean, but they do a great job.
670149
Vivid colors and easy to clean with water and a washcloth. I use this on my chalkboard in my classroom. I have a blackboard, not a green board. I tried another brand, but it didn't work as well. This brand has a nice flow to it. It takes a lot of pumping to get the markers to work, but once they're primed, they work well.
224409
These are wonderful! I just purchased a set for a fellow teacher.  They do not stain our chalkboards at school - I have my state standards and the weeks assignments up all week - and they clean off perfectly with just water and paper towels or a sponge.
4097851
Took 3 weeks to arrive and the colors are slightly lighter and more pastel-like than what is pictured. But as far as function, they work great. The alligator clips were really stiff initially but once you are able to close them for the first time, they are just fine after that. I like the finish of the silicone because it is easily cleaned. The bib clip I lost prior to getting these was really sticky and got dirty often. Dust and lint would adhere to it and could not be completely wiped off. I really can't complain with the price, and I think it's a great value
2108188
The markers work great! As per the instructions, the initial flow does take a while to get going (you have to depress the tip for a few minutes before it gets going, but after that the flow is smooth and uninterrupted. They are very easy to write with! Also, I was very impressed that the shop owner emailed me upon purchase to make sure that I knew that these markers are not intended for use on chalkboards or other porous surfaces, which I really appreciated! I bought them for use with "chalkboard" labels, so I was safe! Any shop owner who will go through so much trouble is worth patronizing! The markers (when dry) are just like chalk thought - it will wipe off if you handle it too much!
1107561
I tired this on a chalkboard and it worked OKAY.  It took a while for the pen to flow and then the ink wanted to take breaks.  It says to be cautious on porous surfaces because it might not come off easily.  This chalkboard didn't look porous, it brand new and looked like there wasn't many pores created with the type of paint used.  I erased the first message after about 45 minutes and it was pretty hard to get off.  I haven't tried to erase the new message.  The chisel tip is also so hard it was difficult for my aunt who has perfect 2nd grade teacher handwriting and myself (also pretty good penmanship) so write neatly.
4227275
These are really good chalkboard labels.  Regular chalk does tend to smear and come off them pretty easily, but I think that's the fault of chalk, not the labels.  Using a chalk pen on them works great and looks really neat. The labels are a good size for bins and baskets that I need to label with one or two words.

They are pretty sticky, but I just wish they had a little bit stronger bond so I could get them to stick more solidly to bumpy surfaces.  I have wicker baskets and woven plastic baskets (the R.E. Y-weave bins from Target) that I label with these, and the edges tend to come loose.  I know it's my problem for trying them on uneven surfaces, but they would be incredibly awesome labels if they could handle it.  None have fallen off the baskets so far, so I'm pleased.