Loved my Chromecast, by far my most used gadget since I bought it. But seeing how CC2 doesn't offer that much new stuff I decided to try the Amazon Fire TV Stick and see where that would take me. I installed YouTube, Netflix and Kodi for stuff like GiantBomb and GameTrailers.
Initially I hated using the remote control. I don't watch any TV whatsoever so I never really use a TV remote anymore. It felt sluggish at first and was just terrible compared to the CC's ease of use. I found out though that you can do the same YouTube Smartphone TV magic with the stick just as as well. All you need to do is connect your stick with your YouTube account and voilà, it's just another Chromecast. Open video on smartphone, tap cast symbol and it's on the TV.
However, as the time went by I found myself abandoning the Chromecast-like usage, now I just grab the remote, press my way to the Kodi YT app, qeue videos relatively easy and all that jazz. I'm not missing my CC as far as YouTube goes anymore.
As far as stuff like Giant Bomb and Netflix go they both work great. GB let's you link your Premium account so you can get all the content you're paying for. Netflix's UI is slick and fast.
One thing I don't like as much is the (unofficial I'd guess) Kodi Twitch app though. Could be better.
Anyhow, that's just my experience with the Fire TV Stick after using and loving my Chromecast. I still have it around since its used prices bombed hard after CC2 came out and I still get promotions out of it. (Just recently grabbed another three months of Deezer Premium).