I have owned the 0.3 liner for a couple of years by now and it's been my absolute favourite liner so I decided to buy the whole pack. As long as you let the ink dry a little bit or don't have a super wet patch it doesn't smudge if you try to erase the sketch lines underneath and it's totally waterproof, I've used watercolours and water based markers over top without any issues. I do feel like MAYBE they could've skipped the 0.1 or 0.2 liner and put another liner between the 0.5 and 0.8 liners or even one thicker than 0.8 but overall this is such a great value.
