Bilstein Shocks?

Anyone have any input on the Bilsteins vs the Edelbrock IAS? I put a set of 4 IASs on my 65 Formula S Cuda but have no real drive time on it yet. The hot ticket shock a few years ago was the SPAS (sp?) but you had to replace the bushings to fit Mopars if I remember correctly. Spent a considerable amount of time talking to the Hotchkis guys at MATS about their products, very nice stuff but $$. Didn't get to go for a ride in their cars like I was hoping. Damn weather!