So it turns out, the science got done, so they made a neat gun for the people who are still alive! I Received my portal gun today, and it's totally the most awesome geek item I own! The gun itself is very sturdy, which is perfect for all the testing you're going to be going through!
The noises and lights are spot on, although I do think there was a slight design flaw. When flicking the switch to go from the red portal to the orange portal, it has to travel through the off position. Meaning it flashes off and on if you don't flick it quick enough.
Also a little bit gutted that there was no sarcastic note from GLaDOS about how much weight I've put on, and no certificate of authenticity etc.
All that aside, this is a neat gun! Now if you'll excuse me, I'm off to do some science!
P.S. Play.com kept me informed of every stage of the delivery process, and the item arrived quickly and well within the allotted time slot. Thanks!