I have been stressing for over a year how to upgrade 3 community and club websites with hundreds of articles. I tried JUpgrade, but it introduced instabilities into my most important website, so, having been burnt, I restored my original back to 1.5. I also even purchased a commercial "upgrade" tool, but it failed too. FINALLY, I have discovered this near-magical extension, and have upgraded two websites from 1.5 to 2.5 in about two days each. That is incredible from my experience. I am now ready to upgrade my biggest and most important website, and I now know with J2XML, that it will be a snap. Three days max. And this is after stressing and trial and erroring for over a year!! I might mention that the J2XML portion only required a few MINUTES! Yes, you have to put the menus together yourself, and make a few corrections to the image locations in a few unusual cases (I just copied the "images" folder over manually), but those are completely trivial compared to the incredible and perfect import of a) all the users, with their ID's, and b) all the articles! Amazing!