Waves are fun and cool! And they make for decent bottle openers. But I don't own a waved knife (my friends do) and I don't see a need for one. It comes right down to you, really. People claim it is good for self defense but others claim that it creates an over-reliance on something that is dependent on the way you draw the knife. In the very least, it is a fun and useful addition but by no means a necessity.