You said: "Cache Cleaner does essentially the same and more "clearly". So, what is this for? Any idea?? "

Sure but you need to read all the features of Xupport to see the difference. Xupport does what Cache Cleaner does and much more - READ features. One thing offhand - Xupport lets you easily move VM SWAP files to another partition.

If all you need to do is cache removal that is a different story.