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Been around for ages.
Personally, I think it's a band aid (plaster to us Brits) rather than a solution.
It basically works of the principles of L/R separation and divergence; when you use headphones, unlike speakers, you get no sound from the left speaker going to your right ear, and no sound from the right speaker going to your left ear - headphones are completely discrete of any divergence.
So systems like these, add a selective amount of bleed to create the effect.
Now add a little EQ and interaural delay timings, and you get different speaker and placement emulations.
Now this is why i don't like it:
Firstly, anything that is applying real time fx to your mix chain is not a great idea. It's never exact, and you're adding a bunch of things to your carefully mixed project that you essentially didn't design yourself.
Secondly, these systems are never exact and don't perfectly match the real thing so you can't actually rely on them as if you 5 different pairs of $10k of studio monitors in front of you to choose from.
Lastly, they are trying to make your $200 dollar headphones be something they're not. Think about it. You can shove a Ferrari body on your VW, but it's not suddenly a supercar - it's still a VW with a Ferrari body on it.
Overall, they are not a bad idea if you have no other options, and only have headphones to monitor on, then in that case why not, but you should never relay in this more than even a decent cheap pair of monitors.
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