Houghy and I both use the full version, and it's incredible. I'm a pretty experienced Photoshop user (since version 1.0) and I'm having a bit of a time getting my head around PixInsight. It's very powerful and infinitely scriptable. Brilliant but difficult.
Great video tutorials (that'll probably be mostly relevant to the LE version as well):
http://www.harrysastroshed.com/pixinsighthome.html