KAIDOH  The ability to record mouse actions, address menu items and to simulate keystrokes is quite powerful and makes this app different from other launchers. Keyboard Maestro shouldn't be taken as a launcher at all (although it works fine as one). It's a utility to stick together any interaction with your Mac you can think of and makes it repeatable. I yet had not had a customization problem the Maestro could not provide a solution for (although some solutions might be clumsy workarounds - but as long as they work ...)

Whoever thought that Apple's Automator could have been a good idea but falls short in some regards: Give this little gem a serious try!   
(Version 3.4)

DONPERREAULT  I had used KM for long time when Michael Kampraph was developing KM. I have used numerous other macro programs in the past few years and have been using iKey for the past year. However, this new version of KM really, really ROCKS! KM's built in web server allows me to launch any one of my numerous macros from my iphone. I can do things that I never expected from a macro program. Many macro utilities seem to not always work. For the past couple weeks I have been putting KM to rigorous testing and it has not failed me yet. The macro capabilities seem endless and the built in server is brilliant. It is freak-in awesome to be able to launch macros from my iphone, from anywhere in the world. I am not affiliated with the developer in anyway, I just think this new version is Brilliant!  
(Version 3.0)

MARZBOT  For automation on your mac KM integrates with anything and everything. Being able to create macros that include applescript and unix makes it versatile and powerful enough for every level of user. Whether you just want a key to start and stop itunes from any app or create a complex sequences of events throughout the mac environment KM is the tool that does it.  
(Version 3.5)

SHARIK14  KM is a fantastic app. I've used it constantly for about 5 years now, and it's become absolutely essential to my workflow. Every time I end up on someone else's computer I find myself desperately, longingly looking for my frequent shortcuts. Makes a huge difference.

The app is stable, intuitive and straightforward, and has a pretty rich set of macro functions you can use. The developer is quite responsive to email, and has been on a tear lately, releasing lots of bug fixes and new features -- including a few that I've wanted for some time (like the ability to use *any* key combo for triggers, not just command/opt/etc.)

All in all - 2 thumbs up. Well worth it.  
(Version 3.3)

PRINTDEVIL  Whenever I put a new OS on my Mac this app is always the first go on. Without KM, my Mac feels like someone else's computer, my productivity is working at 50% capacity. The support from Peter is also as good as the product. I emailed with a query and had the answer by the morning, and a comprehensive one at that.

Keep up the good work, this was and always will be a 5 star application.  
(Version 3.4)

IJONTICHY  We used KM in Editorial on Journey to the Center of the Earth to automate our dailies creation. Once the footage was organized in the Avid we exported an EDL and used KM to automatically add chapter markers with the name of each clip--the first step in creating a navigable DVD for the executives who needed to watch the footage and skip around to key takes.

It was easy to use.

It was powerful.

That combination doesn't happen enough in software, I feel.

I know I've barely scratched the surface but I've used it ever since with great joy.

And might I had how awesome the technical support is. I had a question and had a working answer in no time at all that went WAY above what I needed to know.

Three cheers for KM

(actually I only gave one cheer but used KM to replicate it twice more.)  
(Version 3.5)

DANA SUTTON  Ahhh, that's better. This new version works fine, it's its usual self and better than ever. But I do have one small niggle: this version adds a menu icon and there doesn't seem to be any Preference option for turning this icon off t I resent software authors who clutter my menu with their icons without my permission. I'm assembling quite a collection of these unwanted icons, and personally I think this practice is unethical.  
(Version 3.3)

ILIKETRASH  I used to use a previous version of this (1.x or 2.x) but 3.x broke in a slightly obscure but important way--when switching to another program, _all_ of that program's windows would come to the front and there was no way to change that behavior so that only the window that was the front window comes to the front. This is very important. If I then want all of a program's windows in front, I hit a key combination that is set in the system Preferences that invokes Bring All To Front. I had to switch to Spark to get this functionality back. (I know that Spark is much simpler than KBM and doesn't do as much.)  
(Version 4.0)

WALEED JAMEEL  KM works very well for me. It matches my GTD shortcut keys in Entourage, Safari (makes it behave like Firefox --> one set of shortcut keys only!). Use KM constantly now.

30 day trial was very useful - was a believer shortly after. The buying part was one of the smoothest I've seen - via the software itself. Entered details, done, went on with life without stopping other work.

Amen.  
(Version 3.5)

BILL CLINTON  I have used version 1.x for a very long time and love it. However, I never upgraded to 2.x (or now, 3.x) because I feel that I didn't need all of the added features. (I would concur with one person who requested a light version). However, this is all moot as long as the program doesn't use tons of RAM or CPU cycles. Now, I see "built-in web server" and I can't help but think that this version will truly use lots of RAM. Can anyone enlighten me on this? How much RAM does it use?  
(Version 3.0.1)