I am experimenting with cloud MQTT brokers. I tested CloudMQTT and that is OK, now tried the Adafruit broker (https://learn.adafruit.com/adafruit-io/mqtt-api). It appears to be limited with the number of requests that can be made, with a max of 600 requests in 600 seconds. This should be OK for HASS since it makes 1 call a second? Has anyone else had experience with HASS and Adafruit MQTT broker?
Cheers
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I have not tried it yet, but if I do it, I’ll post here.
It depend on your usage I suppose, an mqtt light will for example send several message on each action (the command is send from hass, the lamp receive it and resend an acknowledgement message to hass).
With sensor (light/temperature/humidity/movement), you could in theory reach those 600 request in 600 seconds even though it is unlikely.
And except if you have special requirement, nothing will serve you better than a local mqtt broker (either embedded in hass, Mosquitto, …), you won’t have any limitation, you won’t be dependent on an external service that can change the limit or stop the service at any moment, you won’t need an internet access and the reaction time will be sensibly better.
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Thanks for the advice. Have gone local now, docker makes life so easy 
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I also went with docker, a mosquitto broker on a debian:jessie based docker container, running for about 6 months on this broker, never had a single issue (with about 20 mqtt clients connected, some active every ~5 seconds)