Fantastic quality and the lines are sharp and precise.
The colours are vivid and they ideal for my needs...or would be but...the barrel is small
I think they'll last a while. However with them having small barrels they give you cramp especially when you've been holding them for a while! Nothing to do with the quality of the ink so I can't complain about that, if I'd of know and they would of had the decency to highlight it in the description, I would of altered my purchase choice and not purchased these.
I draw for hours on end generally in the early hours when my work is done and I'm winding down but I don't think these will be used for prolonged periods of time simply because of the design flaw. It's a really shame because the vibrancy of the ink is fantastic!