I haven't done that and probably won't since I like the stock box setup, but I've talked to Randall, who has been doing this for almost a decade, and seen nothing but rave reviews about his service and his products. I've also seen a lot of stuff he's written and the dude knows his sh1t cold. Not only that, but he's slowly refined the setup and what was good 4 years ago is d@mn near unbeatable now, he even has the rack set-up so you can dial out all bump-steer.
Steeroids uses the SAME parts and a lot of his older tricks, so it's basically a c2004 Randalls setup with some tweaks. IIRC it is just as pain free, but they are n00bs at mustang R&P and it's not as refined (read adjustable) as what Randall currently has, so I know what I'd go with.
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66 coupe 5.0/T5, home-brewed power 4 wheel disc setup, 350hp+, looks like it belongs in 1968
Steeroids or Randall's for my 1966 Mustang 
