I've been using it since its beta and I like it a lot so far. My only issue so far is that when I look at some of my hard drives it just laggs and never opens it up. I have to go back and re-open it...
other than that I really want to get it when it comes out.
Make sure all of your hard drives are formatted in the NTFS file system (if you select the drive with a single click in Computer, it will show the file system at the bottom). If they are already NTFS, run a checkdisk on the drives having problems (right click the drive, Properties, Tools, Check Now, check the 'Automatically Fix Filesystem Errors' box, click Ok. You may have to restart the computer depending on what drive you're trying to check.)