Depends what you want your car to do.. if you want to build a corner carver, then you don't want the MACS - or any other control arm with hard poly bushings on both ends. You'd want something like Pro3i's or MM's pieces that have a 3piece bushing on one end that allows the rear suspension to move around without binding up real bad.
If your after straight line performance and don't care about bind, then they will work fine for you.