I downloaded Webcam Settings on a bit of a whim. I have a Logitech Pro 9000 webcam, and although it technically worked when I plugged it into my Macbook Pro, I was unable to utilize the manual focus feature that had worked previously in Windows. Since the manual focus was the reason I purchased the webcam in the first place, I was upset that it didnt work on my Mac.
I purchased Webcam Settings and much to my dismay, the manual focus for my particular camera was not supported by Webcam Settings. Defeated, I contacted the developer looking for some kind of refund. After emailing back and forth, he told me that I could get a refund through the App Store, or I could give him some time and he would look into the problem. I chose the latter solution, and did my best to help him debug the issue.
Long story short, he eventually provided me with a copy of Webcam Settings with the manual focus working for my webcam. Apparently this required him to actually go out and buy my model of webcam in order to troubleshoot it, which was far beyond what I expected from a developer! The app now works perfectly for me, and I am glad I stuck with it instead of just opting for the refund.