Passive matrix screens get a bad rap these days because they seem to degrade faster/further in image clarity/resolution/granularity/contrast/brightness than active matrix does, but when new they were not really that bad. These days, some are awful, but I suspect that's at least as much about recapping and other maintenance needing to be done.
I've taken care of (meaning, not used, yet kept in stable household environmental conditions away from sun) my 1400cs and in comparison to other screens, it has minimal ghosting, is bright and had good contrast, even pretty good color saturation. As I've said before, I never actually liked it as a system, so rarely used it, and never used it in the past 20 years, yet now it's been in use regularly for a few months, and of all the aspects of it, the screen is close to being the best.
The 1400c however was a great surprise. I have other active matrix screens of course, so I know what they're like, but this is the first time I actually have seen two 'identical' systems, one passive, one active, side by side and used them both, and the difference is amazing, and very noticeable. Yet, moving to the 1400cs, after a couple of minutes, the screen looks quite normal and usable again as I adjusted to it.
Clearly active matrix is better, and always was, but in my experience a good passive matrix display is more than adequate for most things - though I doubt I'd try any serious Photoshop or video work on one!