Welcome to the forum. If you haven't checked out the InfinitiJXforum.com, I would encourage you since its been up before the JX came out and before the QX60. Both cars are very similar and most of the issues, thoughts and ideas have been discussed. Also, there are a couple Infiniti salesmen on both sites that are a great resource if you have questions that you can't find answers to. One works in the Bay Area and the other in Washington State.
I'm a JX owner and help moderate the Infiniti forum and have nothing to do with car sales. Just retired and enjoying these communities (and of course, the car). I do recommend if you are considering the JX/QX that you test drive one thats fully loaded so that you can appreciate the nice technology that you just don't see on many luxury vehicles.