I read at least half of Broken Chains and I felt like something was missing and drop it. While it had potential early on it kind of fell flat at the climax.
Still if you are looking for some seriously crazy AU action it will certainly deliver.
Broken Chains basically ends up with a Sith Harry steamrolling everyone and everything in his way with forcemagic and low grade SW tech.
Voldemort briefly tries to be a worthy adversary.