The VT1xx keyboards used linear switches, you may want to look at modern mechanical keyboards with linear switches as a rough approximation. Having tried typing on one in a museum, I recall the VT1xx as relatively scratchy compared with more modern keyboards, although that could have been a wear and tear issue.

The keyboards of the VT2xx/3xx series are awful, and the later ones had rubber dome keyboards which are among the nicer rubber dome keyboards I've tried. I own both a VT320 and VT420, and managed to get a new old stock keyboard for each.