I'll say this upfront: although I like the command-line, I do prefer a good GUI. I find it infinitely easier to pre+post process my LESS/Jade/Coffeescript files in CodeKit than having to mess around with Gulp or Grunt. Being able to graphically do all my processing, including concatenation and minification, in a graphical interface is a huge relief, and already worth the money. The fact that you get Bower management thrown in, is just the icing on the cake. And then, you also get a full-blown auto-updating local preview server, automatically setup for you without needing to write a single line of code. All of this without having to litter your system with third-party products or command-line tools and plug-ins. This is an AWESOME piece of software, worth every cent.