First of all, this other guy 'Alex Lp' who is acting like a toddler who's parents won't give him a cookie by leaving a low review because he can't handle the fact the there isn't a Mac OS app. That's not a review, that's a whiny complaint that doesn't take in consideration the efforts of the development team and their roadmap that will include compatibility with more operating systems. It's not really hard concept to understand, but clearly it is for some.
This product does what it claims and does it with style. As someone who has an iPhone and a Windows PC without a camera this clearly is the best solution for a webcam. Crystal clear video that virtually no budget friendly standalone webcam can provide couples with great frame rate and some wonderful extra features.
There are a few features that I wish this had, maybe a way to allow multiple iPhones to plug into the single virtual camera (or virtual cameras) to help with unique situations like workout training or wedding livestreams. I also wish this had the ability for custom borders to help make certain cameras stand out, even if it's a simple colored vignette.
Lastly, I would like to mention that with the next version of Mac having this feature built in that I'm glad the dev team here actually chose to make the savvy decision to build out Windows compatibility first. Spending resources where they make the most sense. Also, Alex, if you are reading this then have you even thought about how Macbooks come with webcams where not all Windows desktop PCs don't necessarily? Be respectful and be mindful.