The simplicity in which you can produce different report types with one dashboard is amazing! I wish we had this feature when first starting out at my current position as it would have saved me time spent searching for information that was already there but buried under other tabs/sub-tabs etc.
Sometimes some things are hard to find after being hidden away from view - such as filters or sorting options (eg "by date" vs by type). It's great having everything all together though so no need to jump between multiple dashboards if needed. We've been able solve many issues related to our accounting department not keeping up with reporting requirements quickly enough.