I bought this so I didn't have to keep unplugging my speakers from my laptop at night to plug in my headphones.
It arrived in a little padded envelope, no wastage on packaging then, and it arrived 3 days before it was due, nice surprise! I was anticipating a light, cheaply built headphone splitter that would break after a few weeks. What I received was something with very surprisingly good build quality. It's sturdy and all the connections are gold-plated and it's a very small and discreet little doofer. I plugged it in, anticipating the mono output I'd been worried about and... voila! stereo output! great! I tried my headphones at the same time, and they were stereo too. Very impressed indeed.
All in all, fantastic little gadget, definitely recommend it and I'd willingly pay three or more times what I did for it.
Five stars. :)
Added Jan 2011
After well over a year of heavy usage, the two input ports now don't hold the leads properly so the connection is a bit dodgy. I'm just about to buy a replacement, and naturally I'm going to buy exactly the same thing once again. I was never expecting such a cheap little adapter to last so long, I still highly recommend it.