I don't have the Hotchkis springs but I have a similar drop from Eibach Prokits. Only scrape the largest of speed bumps and just a little. I have FE1s. There is a definite improvement in handling but wheels, tires, and sway bars had the most effect.
The Hotchkis lowers the front 1.5" and the rear 1.1"; the Eibach lowers the front and rear 1.2". Another difference I've noticed is the Hotchkis springs are linear rate and the Eibach's are progressive rate. From reading the forum it appears the Eibachs are the more-favored choice. I've got a set of Eibachs on the rear of my Avalanche and have been very satisfied with them.
I'm thinking about lowering the CTS and would also like to see more pros/cons of Hotchkis vs Eibach.
Looking at the specs I would think the "rake" would be more pronounced with the Hotchkis kit since the rear is dropped 0.4" less than the front. The stock rake looks fine to me and I wonder if there would be too much with the Hotchkis. The picture in this thread actually appears to have dropped the rear further than the front. Is it just an optical illusion or does it look like this to everyone else?
please keep in mind that not everybody has the some shocks. so every single car will sit differently no matter what the combo is. your wheels can and make a whole lot of difference as well as in how your ride sits. it is an appearance thing, thats all...