I'm running Maximum Motorsports CC plates in my car. Never had a problem with them, and will never need warantee on anything.
I've looked at both of MM and SS CC plates, and here are few things I have noticed.
1. Caster adjustment bolts on the SS plates look tiny and would seem like they could get possibly moved under suspension load. Maybe not on the street, but on the track the load is huge.
2. Maximum Motorsports plates look like they have higher spherical bushing mounting point (pictures are a little wierd, I can't really tell for sure), and spacers/shims that will allow the car. When you lower the car, you can switch the shims around to maintain the shock travel, which is vital for healthy and properly functioning suspension. Stang Suspension plates don't seem to have those.
It's only a 40 dollar difference for crying outloud, so why not go for race proven stuff.