How close is that key feel to yamaha Psr-s / tyros series ? [/quote]
This is to me one very well sorted controller and the feel I believe is firmer and dare I say "more positive" is response and touch I have found.
"
SL MkIII boasts our finest and most playable synth-style semi-weighted keybed, with a sprung action tuned to the needs of the experienced player. It’s got aftertouch too, assignable to anything. Its exceptionally high scan rate of 10 kHz gives the keys a super dynamic feel for expressive performances. And you can see scales, modes and zones instantly with vibrant on-key RGB LED feedback."
If you check out their site for information I think you will find it is a leap over the older MK11 board ( which to me had a great medium feel), and this is similar to it. This board has assignable after touch as well.
"
Deep integrations with Logic® and Reason – plus HUI compatibility with Cubase, Pro Tools®, Studio One and Reaper – mean SL MkIII can open up any DAW."
https://novationmusic.com/en/keys/sl-mkiiiAllan