I have an Apex -30mm and i must admit I do like it although now everthing has settled down I think it is lower than -30 (probably not helped by the fact that I am not the smallest person in the world)
The ride quality is still acceptable although with four up it is a bit firm and does hit the bump stops on big compressions.
I also go through a load of underseal replacing what has been scraped off on speed bumps
Have you got an upper strut brace? if not get one as it will transform the car with the lowered suspension