I like how quickly they can create beautiful word clouds from my data sets, as well as their ability to make them interactive by adding clickable tags or links that open in new windows/tabs with more information about each tag (or whatever). They don't offer customizations beyond color schemes, font choices, etc., which may be an issue if you need something very specific done - but most of what we do would fall under "standard" cloud options anyway. Their turnaround time between order placement and completion was also pretty quick! The only downside so far has been having to wait until after our campaigns are complete before being able to see who clicked through vs. those who didn't -- this does not seem to have slowed down any conversions at all though. We're using it primarily to show insights into user behavior during certain phases / events of customer.
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