The new Google Chromecast 2 is not offering any new features overthe original one, so already if you have I coonected to your device, dont run for this new one.
The new one is little faster than original one.
Netflix and youtube videos are not taking more than a second or two. You can feel the performance boost.
All the audio and videos present on google play can be streamed.
But amazon instant videos are not playing.
PROS:
Not costly.
Setup is easy.
Faster than original one.
CONS:
No major changes compared to original one.
CONCLUSION:
If alraedy have older one, avoid it.