Overall I like Overcast, definitely better than Apple’s app. I don’t like UI though — the teal blue color, oversized controls, the “+ + + +” on the playback speed slider, strange layout choices, etc. (I know that these are relatively minor things to most people).

you can change the colors if you get the premium version.

The concept of smart speed impressed me so much I got it. I don’t use the feature a to alter speed a lot, but it’s such a clever way to speeding things up.