I actually found this module when casually browsing the net. I registered to a site and thought, "Wow! Now that is a really cool login!" I checked out the source code and found the url to greatjoomla. I had only a little difficulty figuring it out (I usually do when installing extensions), but found the solution quickly in the forum. Got a very kind and quick response to an email question as well.
If you like the lightbox effect for photos, you will love this for your login! I agree with another review that pointed out that this is a great way to save real estate on your site. It really looks very nice and professional. You really need to check it out! Very much worth paying the license fee to use on a commercial site!