How to choose a keyboard with good function keys

bad function keys-2
Worst example of function keys. ① Continuous row, no group-gap. ② hard-to-press cheap buttons.
keyboard function keys
Good Function Keys. Quality standard key. Grouped so it's easy to hit the correct key without sight.

See explanation at Computer Keyboard: What Are F1 … F12 Keys Used For? Increase Productivity Using Function Keys