I've used one of these for a year. Good keyboard, great value for money. Only complaint is the letters on several keys are partly rubbed off after just one year of use.

I had one of these at home and got exact same one for work because I found it easy to type on. It is smooth and the keys are easy to use. The only thing I would point out is that it is names 'Quiet typing' which it is not. It is the same as the others. The keys click and there is no getting away with that unless you have a laptop-style keyboard with keys made of silicone/rubber.
However, the keyboard itself is extremely easy to use, light and small enough to fit nicely on my desk but big enough to accommodate the numerical pad and the function buttons.