I just bought my Das 4 Professional for Mac with Greetech brown switches the other day, and I decided to return it after using it for just one hour. I knew before I made my purchase that this keyboard does not use Cherry MX switches. It uses clone switches made by Greetech. I expected these clone switches to be worse than Cherry, but I didn't expect them to be THIS bad. It's still amazing to me that pretty much every key feels different. Some keys feel stiffer and other feel softer. Some keys have a distinctive tactile bump and others are barely noticeable. To make things worse, some keys are just downright scratchy. I mean you can not only feel but also hear the scratch when hitting the keys. And the space bar is really mushy. It really is a shame that Das chooses to use cheap clone switches on the Mac version. The PC version still has Cherry MX switches. I like the design and build quality of this keyboard, and additional features like the USB 3.0 hub and media keys are nice to have. The bottom line is DO NOT BUY this keyboard. It's simply not worth the money. Das Model S for Mac is a much better option. It's cheaper and it has Cherry MX switches (blue). If you want brown switches and with Mac layout, then check out WASD Keyboards.