Mine squealed for the first 500-800 miles. After the break-in period I went through a normal bed process and everything was fine. You're going to want to get them really hot. Not just a single stop from 50.
A good description @
http://zeckhausen.com/bedding_in_brakes.htm . Set your alarm for 3 a.m. and hit the nearest remote interstate/highway. It's actually kinda fun since you get to know the limits of your brakes and tires.