VERY good. The car rotates much better, giving ESP a much-needed workout. Way less weight on the front outside wheel in the corners. Firm without being harsh. Nice and low... wife wouldn't have noticed if it wasn't for my tires rubbing
...for anyone interested these guys are very easy to deal with!
If anyone is interested here is a link to a pic of my car and details on the ST coils I bought from HPA. In the pic they are cranked almost all the way up, so there is a ton of room to go lower. The ride is great, and the install was very easy as all parts lined up properly and the instructions were very well layed out.