I am a follower of a Russian psychology system called Socionics, which is similar to MBTI, but different in many aspects. Typing from MBTI does not always line up with typing in Socionics, as P vs J is based on how a person metabolizes information (although this usually leads to classic J or P characteristics such as messy vs neat, although not always). However, Socionics is more in depth, and has a very elaborate intertype relationship system. According to Socionics, the Dual (perfectly compatible psychological relation, based on IM functions) to INFj is ESTj. I have had a relationship of duality in the past, and from personal experience will testify to the fulfilling nature of the relationship. Any experiences with ESTjs?