Kind of a hassle to use.

This app does what it says it does and has a clean/simple interface but has some reliability issues and poor usability.

Reliability (2/5)
When in manual mode, and in some applications, the aperture will occasionally reset back down to 0. (happens every few minutes in skype, and also sometimes when opening a new camera application)
Occasionally, the controls will get "stuck", forcing you to restart the application.

Usability (3/5)
First of all, the sliders/controls dont make a lot of sense.
For the exposure-time/shutter-speed, you are given a slider… but only the first 1/10th of the slider gives usable results making it hard to adjust the exposure time accurately.
A better solution would be to use a stepper control, or limit the usable exposure time to the first 1/4th of the range.
There is a control called "aperture"… but the webcams on most or all macbook/imacs have a fixed aperture if Im not mistaken. This is probably the ISO/gain/amplifier setting… and you have to hold down a stepper button to adjust it (takes 10 seconds to go through the entire range). a slider would have been much less frustrating to use here.

Lot of features are "grayed out". Im guessing some features are available to certain models… i dont really know. (aperture/shutter priority mode and NR doesnt work on mine)

Something like a Exposure-compensation setting would have been awesome to have since usually the auto-exposure is only off depending on your shirt color or background color.

James++ about Sight Control