My parents bought a Chromecast and I was able to set it up with my Mac and test it out without a hitch. There isn't very much propriety usage of a Android or PC device that I see that is needed by being a mac user. Everything seems to run smoothly using Chrome Browser. When you install the Chromecast Software onto your Mac, a new button option appears on the browser bar that lets you "Cast" your screen or youtube videos onto your tv directly from computer. The reason I wasn't a huge fan of the unit is the simple fact that it's reliant of having a device (smartphone, computer, tablet available in order to make anything happen. This is where AppleTV, Roku and Amazon Fire TV win in my opinion. You just turn them on and start using them.
I purchased an Apple TV last week because I was tired of waiting for the next best thing from Apple in this category. I was simply looking for the best option to play videos that I've downloaded onto my computer and onto my tv screen without having a long HDMI cable going across the room. The Apple TV solves this issue for me and that's all I need. I don't have any subscriptions to HULU or Netflix, or HBO, etc. It's nice that these other apps are available but I don't find myself wanting to use them for the time being. Now if Apple can just open up their API and allow 3rd partiers to get in and also end the restriction of only play files from your iTunes library without using Beamer/Airplayer, all would be happy.