bitflipper
Don't all these work the same way, by bleeding each channel into the other with a small time delay to emulate HRTF?
I can see a benefit for those who are forced to mix entirely in headphones but want to get an idea of how their mixes will sound on speakers. It might conceivably help those folks make better mixes. But I'm having a hard time making a case for anybody else benefiting from it.
Yes, they're all based on cross feed, delay, EQ and room simulation. I am one of those who mix entirely on headphones in order not to bother my family at 4:30 AM!

Sonarworks has been a huge help and ultimately, my mix gets a listen in my truck on my way to work. Sonarworks has definitely helped me get my mix really close but these speaker simulation plugins have never helped at all. Everyone will have a different experience though!