Duokan is not easier to install than the MobileRead jailbreak and packages -- they use our jailbreak (without accreditation), but their own certificates.
Installing third-party software on older Kindle firmware was easier, though -- whether MR or Duokan.
I don't expect Duokan to work, they haven't opened their sources and currently the only way to jailbreak is over the serial port -- which they don't support.
If/When a closed-Kindle jailbreak is discovered, Duokan will incorporate that method.