Robust, full keyboard, does not take up too much space on a desk, pleasant and responsive mouse. What more to less than 20? The equivalent in Logitech costs 50% more expensive.
New comment: usb dongle has not held two months too fragile! I can reuse my old keyboard I just got a keyboard + mouse Logitech MK 270 22.81 shipped, I advise you strongly, see my review on this product.