Xara Cloud has almost no basic tutorial pages ....

[handrawn]

there are various level of collaboration...

if there is one [set of] office documents and lots of people have input and involvement at the same time, then cloud is a great resource

if on the other hand you have lots of creative people but each has a very different job to do, then it might perhaps provide a vehicle for informing progress in a 'screen-shot' sense but I'm not sure it would help in any other way, as you cannot demonstrate what you actually did in a XAR file because the features in cloud are so limited relative

I have no use for it myself

The page you linked egg is indicative - the thrust of xara gmbh now is all about enabling office to brand [with websites, documents etc] and interface with social media; social media is possibly where you might find what you are looking for I don't know