I prefer the (open source) videospeed Chrome extension [0]. It gives me a much wider range (thus far I used up to 5 x speed; audio is blanked above 3 x speedup), 0.1 increments - and keyboard control. The latter is essential to me, I can watch sections of online lectures at high speed and quickly slow down without fumbling for the mouse to watch the few sections that demand more attention at lower speed.

[0] https://github.com/igrigorik/videospeed