Note that I have a macbook with Mac OS X 10.6.8 (Snow Leopard) and I was surprised to Chromecast facility to have an error message: "not compatible OS." Indeed, there must be a minimum to 10.7. In short, I had to update my OS macbook Yosemite in the last version (which is free) which took me a little time. Once the update is complete, I managed to successfully install on the MacBook Chromecast. And there can be "caster" its Chrome browser. Cool .... But "castable" contents are solely those of the Internet (Free: YouTube or paid: NetFlix). I installed Plex media server to "caster" my own videos stored locally on the MacBook on TV. After a somewhat laborious installation of Plex I managed (crash, reboot and rereboot). Plex requires a lot of machine resources (cpu / memory) for Plex encode in real time to cast the film on TV. On my unibody MacBook with 4GB of ram and a 2010 CPU, one feels that he has trouble, especially when many launch 30 to 40 seconds it takes the movie starts on the TV.
Regarding applictions tablets, I tested the iPad and AC works fine. For example Pluzz and Youtube. And it works nickel. One benefit is that the Chromecast your smartphone, ipad etc. serves as your remote control and you can turn off your iPad ca continues to turn on the TV. Very important point you need a good (very good view) Internet connection to enjoy HD. Indeed, the quality Chromecast adapts to your Internet speed. As I am at Numericable and I 30 Mb / s is really great.
In conclusion, for 35 euros ca be a shame to pass!