I have started using KillerPlayer, the day I grabbed it on appsume since it came at the right time when I needed it. Simple yet effective player. Video based online courses are my bread and butter and KillerPlayer is helping me boost my efforts.

Pros:
[1] Sleek and sexy looking player themes
[2] Simplicity of the app
[3] Effective and stable app

Cons:
[1] Dashboard Features are minimal now
[2] Players need still more functionality

Hope they respect the roadmap. KillerPlayer has the potential to be big contender in the video tool space and I wish them all the best.