spacemule
The Peanut Gallery
And why?
Flippy, because your buddy the gorilla can't over tighten them and force you to use tools to get the standard screw cap out. Although the gorilla might be able to break the flippy cap which will make him truly a gorilla! I will say that every once in a while Stihl makes a flippy that just isn't quite right, the one on my string trimmer was that way until I replaced it. The flippies on my chain saw have never given me any trouble in 7 years.