Comment on Disk Inventory X

The beta version is absurdly faster on Intel Macs, startup went from 1-2mins to as many seconds, drives with 850GB of stuff scanned in a minute, window resizes instantly (instead of 30 seconds of redrawing) - it's usable again!

The Folder-sidebar view is extremely useful (especially in conjunction with the block'y view - click a folder and it highlights it in the main view)