I'm a native Portuguese speaker and I can say that this is far from how people speak Portuguese. It sounds like pretty much other TTS solutions.

However, Spanish and English are awesome and really sound like a person. This is great!

Edit: After playing a little bit with it, it does sound better than anything I have seen before even in Portuguese. I believe that the weirdness is just for the standard/demo phrase. When I tried some custom phrases (curse words, mainly) it does sound very natural.