This ink is great and hard to buff, it's perfect for mixing with other inks to make a messy hard to buff tag. Over all the price looks cheap but it isn't really a good value. For instance 200ml of otr 484 refil ink is $10. If you get 200ml of pilot it would cost around $18.
I already did a review on this ink a while back, but I just wanted to add something that I don't think has been said in any of the reviews yet. It's not an earth-shattering revelation, but the metallic colors (gold and chrome) don't seem to dry out or evaporate at all like the other colors do. I've used a few of the other colors over the last 4 or 5 years and noticed that if you fill a mop and don't run the marker dry within a week or 2, it starts to thicken. This problem is easily fixed by adding some Xylene to the ink and shaking it up, but I thought it was interesting that the gold and silver colors don't seem to have this characteristic.