I have GoDaddy hosting for one of my websites. I originally set up Joomla through their hostingmetropolis "value applications" feature because I figured it would be easier. Well apparently the MySQL database that they set up for you is not under your hosting but on a different server all-together. Unfortunately they only give you the joomla admin name and password and not the one to database. I wanted to install a component that required use of the same database as the joomla install. Needless to say, I was out of luck. I emailed GoDaddy's support and they told me that they couldn't help me because hostingmetropolis is who sets that up and not them. The kicker here is that hostingmetropolis IS GoDaddy! I emailed them back to ask them how I would go about fixing this problem and they told me to uninstall Joomla from hostingmetropolis and install it manually. So now I'm screwed. I have no access to the raw database because they can't/won't give me the password and I have a ton of content that I need to transfer over to a new Joomla installation that I'm going to manually create. Greaaaaat.
Fast forward to finding the Joomla! Pack...
I install it easy as apple pie, follow the instructions on how to backup my database/mambots/modules/etc. and how to restore them somewhere new. I can't tell you how smoothly this went. I was up and running again in about an hour flat. My only complaints, and they are but a few, as others have said, that whole username and password business when reinstalling (by accessing http://yoursite.com/installation/install.php) is useless. The new Joomla site uses the same exact database as the old one so your original joomla super admin username and passwords are the ones you want to use. I think it's a remnant of their variation of the installer that puts it there, so just keep that in mind and you're fine.
Second complaint, it does NOT keep your Site->Global Configuration settings. I had to go in and turn back on SEF URL's and a few other settings like linking titles of articles. Like I said, nothing major. Other than that, every single mambot, module, addon, doodad, etc were all in place exactly as I had them before.
If I could give this a star rating, it would be a 4 1/2 out of 5. Very minor grievances with an extremely satisfied result in what it does, and the best part about it? It's free. Thank you guys very much, you've saved me immensely. I would never have been able to get all my old data without this!
Sorry for the long review, but I really do endorse this product, it does exactly what it says it's going to do!