Worth it!
I was looking for a program that would allow me to easily/quickly switch between resolutions (mainly 1280x800 and the full 2560x1600 on my haswell 13” MBPr). This does exactly that! Well worth the half-a-coffee I paid for it since you can’t even choose 2560x1600 in the display menu. It puts any external displays in the drop down as well.
Cody.Ray about
ResolutionTab