For those who want to use JUICE and PHP5, I found this recommendation in extensions.joomla.org:
This one saved my butt . . . by ryates, October 31, 2006
I had a critical user import of 400 users to do and was about to dig in to figure out how to do it through the back-end db when I found this extension. What a life saver.
I did have to make some changes in the script to get it to properly support PHP5. If you run into a problem with no load happening and no errors and you're on PHP5, simply edit administrator/components/com_juice/admin.juice.php and change any references of $HTTP_POST_FILES to simply $_FILES. (Hope I'm no offending anyone by documenting this change)