The issue is: the practice that I got was amazing, but the theory is... not worth listening to. Fortunately, it was cheap, so 10 hours of practice and 1 hour of entertainment (is what I called it) was fine.
Though, if others have other Vipassana retreats, then don't consider this one as better.
Also: I wouldn't go in expecting that you'll experience my description above. However, you can go in with the idea that you're training your emotional intelligence, somehow. It's up to you to discover how it happened. For me the effect was screamingly obvious. But I can't guarantee that it will be for you and if it isn't then it's tough to distinguish it from placebo. With all those disclaimers in place, the above website is where I did a retreat (3 times now).
What I think that happens: my insula attached to the default mode network and is feeding information into it. It gives the ability of being much more sensitive at certain forms of empathy.
I remember before I went in thinking: research says I'll be better at emotional intelligence when I do this, I wonder what will happen. 10 days later I realized I became a lot better at empathy. So my emotional intelligence did grow :)
There's quite some research on this, but I'm going to be lazy and simply recommend Search Inside Yourself.
Disclaimer: the experience discussed in this comment is one of the reasons why I chose my username back in the day. So I'm biased.