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This is a great app.
I use it for a long period of time and this is the simplest way to find the largest files and folders using space on my computer. Very easy to use and seamlessly integrates into the Explorer window of Windows. Right-clicking any folder brings up the xRay menu choice and by just a click starts investigating my machine.
Pros: Can tell only pros about
Cons: the only small bug is that it crashes when counting my C:Windows folder (Win64 bit).