It all comes down to the freight. I don't have a problem with overhauling a BMC and I am opting for a newer assembly due to the sketchy split reservoir stock set up. They went to a single integrated reservoir for safety reasons. Iif you had a system leak, it would completely drain that circuit until it failed - with a single shared reserve it would need to drain all of the fluid before you were in trouble and there's more fluid in them. Not as lethal as old VW brakes (single circuit all round) but not far off it. It'll be easier to fix an updated set up as well. Gen 1 stuff is on the endangered list and rebuilding the rear brakes are gonna be a pain, so an LSD rear not only improves traction but gives me better braking and I'll have way more luck replacing components.