We use this item extensively in our business, and find them very good. Leaves a smooth clean surface that is able to be written on straight away, and is a much superior product to the older pen or brush versions. Only problem with this product is I would like to be able to purchase the refillable option online. I know Liquid Paper have a version of this product available (Slightly different shape- longer) We go through quite a few you see, and I dislike the amount of single use plastic in each one. I would prefer to buy several of the main body for the offices, and from then on would only require the refillable inserts. Much better for the Environment!