Frieza's final form is certainly the best designed, and I love the introduction here. Especially in this panel, the shading is just excellent, and the eyes just makes him feel so threatening. I liked the moral dilemma Dende had here and that Piccolo was ultimately the one to change his mind (I also liked Vegeta kicking him), it prevents Dende from just being a walking healing machine and makes him feel more like a character. I'm also glad that Frieza quickly took out Dende, because having a healer during the final climatic battle does a lot to knock the tension out of the fight. The real fight begins now.