I have begun to use the condition slider often, and making new personal presets that include it, usually moving the slider rightward away from "mint condition" to anywhere from about .07 to .35 or a little more.
The condition slider does add a lot of color, richness and complexity to the tone, although I do think it's best to start at "mint" (newly tuned, new strings, new everything) and slowly learn what sounds good to one's ears.
Anyway, yeah, the condition slider above the virtual keyboard seems to be a rarely used feature that people should feel encouraged to experiment with and use more often.
--
Linux, Pianoteq Pro, Organteq