I like how easy it is to set up categories, assign tags or remove them. Also how simple it would be to do bulk edits. Sometimes tags don't sync if you have multiple computers, it's not 100%. If your tagging with several people in a house, it can get messy and sometimes things are missed. Notifications can also be tricky. Sometimes you don't know what to tag. If there is no category that fits, it's hard to find something else to use. We used it for our website to make it search friendly. It helped us track our site traffic better and help marketer clients find what they need easier.