MACMARIA  Very stable and when I tested it with other applications like WhatSize and OmniSweeper I found Baselines faster.

I enjoy the possibility of comparing the changes between the last measures (saved baselines) and the current one. Very handy.

The 20$ is a little bit too steep. I bought is during a promo and paied half price.  
(Version 1.1.1)

MILDM8NNERED  Hi Xplicit

A new version of Baseline that addresses the issues with deletion and useability is coming soon.

We've already got most of the requested changes in place, but are still polishing and debugging.

cheers,

Martin  
(Version 1.4.1)

ULTGAMES  Really useful app. Fast and stable.

Emailed support with an issue that turned out to be user error and got an email back with the solution within 40 minutes. And this was at 10pm on a Sunday evening.

Highly recommended.  
(Version 1.1.8)

DAREALGREG  Great support!

Had a problem with the tool bar on version 1.1.6 on Leopard. Developer had a work around within 15 minutes and a New version 1.1.7 is already being downloaded on this link. Get this application now with the discount. The ability to compare the results with past scans, including the hidden files and instantly see what files are growing, compress a file to create space, and reveal a files location in the finder. I know of no other application that does this.

Two years ago I had an invisable var file in the System Folder that grew to 68 gigs on my PB G4. Filled all the disk space and slowed system to a crawl. Took me hours to find it, this would have found it in minutes.

AND ITS FAST!

Scanned 146 gigs in 2.5 minutes on Alum iMac  
(Version 1.1.6)

DON MORRIS  Incredibly fast scan. I'm not a fan of tree maps, though, and this one is much more difficult to read -- at least for me -- than those produced by GrandPerspective and DIsk Inventory X. I prefer the charts used by WhatSize and DaisyDisk.

The list view fortunately can show items sorted by size, because the column view doesn't. No, excuse me: there's a bug -- or at least a poor UI decision. Column view sorts by the sort setting for list view. There are no sort controls in column view, so it's not immediately apparent how to change the sort for column view.

The UI otherwise beats the two free apps I mentioned; that, along with its additional features (baselines, duplicate finding) may justify its price.  
(Version 1.5.3)

MILDM8NNERED  I know it's taken a long time in coming, but Baseline 1.5 now supports selecting and deleting multiple files or folders. Undo support is present as well (until you empty the wastebasket or rescan the volume), in case you accidentially delete the wrong stuff.  
(Version 1.5)

XPLICIT  The app runs stable and scans disks quite fast. On the contrary working with it in a fast and productive manner is not possible:

-> No shortcut for deleting files

-> Command-Backspace empties the trash (not like the finder)

-> multiple selection of files is not possible

-> every deletion (of a single file) must be confirmed, this behaviour cannot be changed

-> no live updating of changes by external apps (by the finder for example)

20 bucks is too much for such a tool, especially if it's limited in its usability like this one.  
(Version 1.3.6)

XPLICIT  Certainly there has to be done some work on the usability of this app. Instead of moving files to the trash "Command-Backspace" empties the trash. A shortcut for deleting files is missing completely. Dear developer, why would you do that?  
(Version 1.3.6)

RAMPANCY  Baseline lacks the nifty radial view that WhatSize now has, but I like the look of their Tree View mode a lot more than GrandPerspective and Disk Inventory X.

Oh yes, and Baseline is much, much faster than any of them.   
(Version 1.1.6)

GRYPHONENT  Whoa... this new TreeMap View is amazing. I can strongly recommend Baseline for finding those large files that take up space on a harddrive.  
(Version 1.1)