*** This is for all jailbroken devices running iOS 5.1.x *** I'm currently testing this for the guys over at iMZDL before it goes public. First of all, it's lightning fast. Not only do you install the normal certificate from the SiriZone install site for the server you wish to use, but once you install the port from the iMZDL repo, you install another file specific to the server you've chosen. This removes the need to copy and paste or manually input a proxy address into a box, as there is no actual section like there was in Settings with Spire or AC!DSIRI, so in that regard iMZDL's port appears more 'integrated'. The only options you have with Siri are in Settings/General to turn Siri on/off, which I like as it appears exactly like a 4S, no stand out tab for the actual port. As I said though, it's amazingly quick, by far the fastest Siri port I've used. Results come back near instantaneously as opposed to Spire, Spite, or AC!D which can, and do, have delays. Keep your eyes on @SiriZone on Twitter for more information.