wilwood dyna lights are they worth it?

[GMC70c20]

I am in the process of building my truck and am thingking baout the brakes. It was a c20 long bed, I shortened and boxed the frame, put a fatman mustang II front end with qa-1 adjustable coilovers under it as well as a 9" under the rear with 4" drop monos, Qa1 adjustable shocks and caltraks, a 550hp 408lsx set abck 4" with a turbo 400. The front end came with brakes but they are just the stock ones and the rear has the factory drums on the 9". I was looking at a set of dynalights from wilwood but one thing that concered me was the hubs are made fo aluminum. It said they were for street use on muscle cars so I would think they would be ok. I am not going to tow or haul anything with this truck it will just be a street rod that gets driven when its nice out. My qeustion is how much weight do they save over stock half ton brakes? and how durable are they?