Introducing adult pigs?

I'm curious if anyone has made an attempt to introduce two adult pigs. Thankfully I read that it is far easier to do introductions before the first pig reaches a year old. When Hazel got some weight on her, I moved her into Bentley's room (he was about 5 months older than her). They seemed to immediately take to one another. I'm not sure if I lucked out or not but I'm curious to hear about other's experience on the topic.