The LK20 is a Tenkeyless keyboard, the number pad was therefore omitted. Of which there are also some other on the market, but often the rest of the layout and the arrangement of the keys will be renamed or only installed a variety MX switch. Since the LK20 therefore sets itself apart from the competition.
The keyboard is excellent workmanship: Low clearances, heavy weight. They strongly reminiscent of a Steel 6Gv2.
This processing is also reflected in the typing feel: It is much more pleasant than, say, a current Cherry MX Board 3.0.
Priced the LK20 suggests also good: Mechanical keyboards without numeric keypad start times now in this price range only, but one might a rational layout, a beautiful, easy to read the label and MX-blue, then you can not get at the Lioncast.
Yes, the keyboard has partially backlit buttons, but you can exhibit. Media keys via FN are also available.
If you want to complain about at a high level: A USB hub would be nice, or a removable cable. But these are really Peanuts and in this price range anyway not self-evident.