I've ordered, and returned to, Ergoguys, directly, and they are very much legit. No idea about the device.
I wish I could get away with a spring-based KB at work, that would bottom out properly (you should be able to feel hitting a key in your shoulder!), which no dome or scissor can. I use a good dome, but just because even my quietest other keyboard, an Acer mechanical w/ ALPS-like switches, is too loud. I've been tempted to get a Cherry-based KB w/ blacks or reds and o-rings, but haven't wanted to spend the money, when I don't have a use for it at home.
IME, the only way to get rid mouse-related problems was to get rid of the mouse. I can game all day w/ no RSI, but regular desktop computing I just can't do, regardless of mouse shape, weight, etc.. There are touchpads, digitizers, trackballs, joystick devices, and more, out there. Don't limit yourself to a mouse, OP.