Now, i don't have an engineering degree or anything, but i think the description as to why linear springs are tougher to drive with is flawed.
The description operates under the assumption that a linear spring and a progressive spring will compress identical amounts under similar cornering forces...but that's simply not true. A progressive spring that has a rate that ramps up to higher rates than the linear spring will compress less for the same corner, effectively absorbing and reacting with the EXACT same amount of force a linear spring would, assuming all other factors (cornering force/style) are all the same. In fact, the progressive spring would result in way LESS body motion, and a more stable/easier to control drive.
In fact, the whole point of having Progressive springs is so that you can START with soft spring rates that are comfortable when cruising, but they ramp up to stiffer spring rates so that the car stays flatter under hard driving. I'm pretty sure it's what prodrive used in their P1, which was supposed to be both the most-plush and best-handling GC ever made.
I ask that you please reconsider the linear/progressive description used in the sticky, as it's VERY misleading and could push people who don't have the time to think about it in the wrong direction.