Hi Alex,
Great question, and I appreciate that you've come to The Hub to ask for opinions on the new ExtremeCloud services.
Given the lack of responses, I think it's safe to say that this is so new that not many people have had the opportunity to really evaluate it. It is also likely that those who have adopted ExtremeCloud just aren't on The Hub.
I'll keep the topic open for responses. Over time, I hope that it is able to bring good feedback to you and to us here at Extreme.