ThinkComputers.org reviewed the Mountain Everest 60 Gaming Keyboard
A quote from the article:
Last year we took a look at a very interesting keyboard from Mountain in their Everest Max. This keyboard offered a modular design with different elements that you could attach to the keyboard. While this keyboard was great, many people may not have wanted such a large keyboard. This is where the Mountain Everest 60 comes in, with a 60% form factor, Mountains own mechanical key switches, PBT keycaps, Cherry stabilizers, and you are still going to get the ability to add on different elements to this keyboard. With that Mountain sent us their Everest 60 numpad, which is an optional add-on for this board that can be attached to either side of the Everest 60.Mountain Everest 60 Gaming Keyboard Review