They are very carefully rebuilt boxes with reduced assist for more "feel". Careful rebuilding reduces slop and seems to help them last longer.

I run level II and like it. Most folks like level II or level III. A firm feel box would be a great part of a handling package.

Besides the box itself, other factors influencing "feel" are alignment settings, tire size and steering wheel. More caster increases feel and effort as do bigger tires and a smaller wheel.