Portuguese is usually not supported, and if it is, usually is the Brazilian variant, and I don't feel like playing accents just for making myself understood.
Also I have a multi-cultural life, so something like sending an email to someone usually requires at very least two languages, which those devices don't support.
Killing Cortana is one of the first steps of everybody I know who switched to Win10.
Haven't seen an Amazon Echos yet, not even in flats which homeowners use a massive amount of home automation gadgets.
- East German
She is using Siri a lot.
That and taking videos/pictures of everything :)
However, I recently bought a German Amazon Dot device and I think I'll keep it. Right now, it's main job is to play music but I also use it for setting timers and to tell me the current time and weather. I've never used other "voice-based assistants" before but I can see the benefits that come with a dedicated device like the Amazon Echo. It's really comfortable if you can control things with your voice, you don't have to get to your PC or smartphone first. I'll probably integrate it with my home automation system to control lighting, and maybe add a media center like Plex/XMBC, too.
Edit: The only thing that bothers me is that the German voice is not as fine-tuned as the English one, and as of now there are not many skills available (built-in as well as third party), so I switched it to English. But guess what - you can't use the English skills unless you port your German Amazon account to amazon.com... the Echo is essentially handled like a kindle device on the server side, which means you'll lose all your eBooks and music if you switch...
However, as usual there are parts of the german society that won't have any issues using stuff like Alexa. "I have nothing to hide" is also a popular way of thinking in Germany, history be damned.
Could be a subjective impression, linked to the project and wrong when looking at the bigger society, but at least so far I believed it. I acknowledge that Austria was also part of the streetview hysteria that broke the project over here. Might be a differing indicator.