They are awesommmeeee. Not sure the exactly sure of the differences specifically between ikv and let's say boges, but the taste/th/flavors comiing out of them, to me, are a lot better. They are mostly single coils in a standard or xl size (ones longer than the other for larger tanks). Punching cartos is for use inside of a tank, so if you're just using the carto by itself, you don't punch them. However if you do use a tank system, they do sell prepunched ones, but punching is easy and I like doing it myself.
They have a few different lines of cartos, silver, platinum, gold, or fusions. They are all good, fusions being the best supossidely, haven't tried them yet because I can never find them in stock. Which is my biggest problem with ikenvape...their stock is always out!