I had the lowering link adjustment done. The ride in normal height is fine, if you drop it down it gets a little firm. I like the way the car looks.
LK

 

I had lowering links on my 06 CTTS. Rode around in lowest height all the time (mainly highway) and loved it. I did however get an alignment in low ride height mode so I would keep the tires from prematurely wearing... It worked wonders since this was the height I was riding in most of the time.