I would not say that my US Gear 4" inline e-brake sucks in any way. Sure, I have a few issues with it, but it works as advertised.
It's electrically operated instead of vacuum like the BD model. You just put it wherever it fits in your exhaust, and then run an electrical connector to it, and that's it.
My issues with it are that it's engagement and disengagement are noisy and it has a self-test that it goes through whenever you start the truck (unless you remember to override it). Other than that, it works fine.
Rob