This works! I can use my Apple Air laptop and two additional displays with this device. However, the other commentators are correct in that the directions are challenging. If you are only a novice, do not try this yourself - get someone with more experience to help you - it is worth the effort to install this with minimal frustration. The result for Apple users is great, as I was frustrated that my new Apple laptop couldn't do this by itself (like my alternative work Dell laptop) - and having three monitors is sooo much better!! Someone should develop a YouTube instruction video for novices to install this. I'm glad my wife (a Apple friendly teacher) helped me.