I got this keyboard from the Rk Outlet. Love the feel of the keys. The bluetooth pairs with my Ubuntu systems easily. Looks good. Love the amber backlight.
I'm coming from a Happy Hacker Keyboard and am have almost 40 years of Unix experience. Things I don't like about it are pretty much inherent in this being a 61key keyboard. The overloading of the escape / with tilda and backtick, those three keys are pretty important under unix.. Not being able to switch control and capslock (in hardware). Not being able to disable the function keys, again, in hardware. The problem with the Fn+Key remapping keys, is that sometimes it gets accidentally pressed and on has a keyboard in a wacked out state. then you have to grab the manual and figure out how to get it back.
Am probably going to get the RK 68, cuz it resolves the ESC/tilda/back tick.