A solid weapon of self-defense, the weight is noticeable, the materials are of moderate quality. Under Linux it is quite efficient, incl. additional buttons (even a calculator), except for those via Fn (xfce 42022; 42022.0-48-generic #51~16.04.1-Ubuntu), but everything can be bound, the buttons are readable. I have a double impression: it seems convenient, ergonomic, there are a minimum of extra buttons, but the pleasure of buying disappears as soon as you look at the top keyboard block.