I am reading this thread on the result of an internet search and discovered that I had posted a response four years ago!
I was thinking of a guy I just met who seems nice enough but the synastry/composite is horrible. It reminds me too much of the synastry of me and a relative who was born only two months after this guy so all the outer planets are only a few degrees apart. She has her Neptune exactly conjunct my Sun, and opposing my Moon-Saturn conjunction by 3-4 degrees. Her Saturn makes an exact conjunction to my second house cusp. Her Sun makes a 1 degree conjunction to my Jupiter. Her Pluto makes a 4 degree square to my Mercury-Mars conjunction. Her Moon makes a 2 degree conjunction to my Pluto. Her Uranus makes an exact quincunx to my Sun.
In the composite Venus is exactly conjunct the 12th house cusp, and Mercury, Sun and Mars are in the 12th, however Mars conjuncts the asc by 1 degree. The asc is at 25 degrees Taurus, tightly conjunct malefic fixed star algol. Since Mars rules the 12th house, it being right on the ascendant is even worse. Saturn and Pluto are exactly conjunct in the 6th house. The nodal axis conjuncts the 2nd-8th house axis by a couple of degrees (can be bad for finances)
The reason I mention it is because it is probably one of the worst experiences I have had with someone. She talked to me well on facebook, befriended me at first when I got to her house, and told me all of these personal things about her life, but the synastry doesn't lie and eventually it was found that she was a nightmare. Do keep in mind that in general she is a difficult personality, she is always complaining she has no friends, and she is lonely. I felt sorry for her at first but then I discovered why everyone feels the way they do towards her.
For starters, she had taken a lot of money from me. I was staying at her house, and whenever we went out, she would make me pay for everything, including her tickets to tourist attractions, transportation, and meals. She believed that since she was showing me around town that everything was my responsibility. To top it off, when we went shopping, she would always take all my stuff out of my bags and put it on the bed and examine it at home. Later it became evident that she was looking at the stuff to determine what she wanted to take later; she was actually stealing some of these tourist keepsakes I bought for people back home. Unfortunately it was not safe for me to go out alone in this particular foreign country, and no one else was available. If I refused I would just be stuck at home all day. If you are wondering why else I couldn't confront her, it was because she had already been accused of stealing by others in the family and she always acted like a drama queen (even though she took the stuff). She knows now that people have stopped accusing her because they don't get the stuff back, it strains familial connections, and she never faces any consequences from her immediate family. Her family is convinced it was the maids! And interestingly, she was always warning us about the maids, and how they would steal money and other stuff, which was just a convenient cover for her.
Sometimes Jup conj Sun can be nice, but when the rest of the aspects are so bad, Jupiter just magnifies the worst. In the composite Jupiter is in the first house in its detriment Gemini. On top of it, she erased the photos she took of me on her camera (when mine was out of batteries for a couple of days). I specifically asked if she could email them to me, and she kept saying she would, but when I returned a couple of days later from another city, she told me her young cousin deleted all the photos. I had asked the 12 year old boy if he deleted the photos and he told me he honestly didn't. I knew intuitively she had deleted them. I had heard her talking negatively about me with her mother a couple of times, but she didn't know I overheard. When I went to visit an astrologer, a meeting that I had requested her to make with her family's astrologer, she ended taking up half of my time with him. I had traveled half way around the world, she could see him at any time, but she chooses to interrupt my session with her personal questions. Then she has the nerve to rush me out saying we are going to be late coming back home. Overall she just became more and more aggressive and rude as the days went on when we were alone together. If my parents were also there, it was only then she would be nice.
It was an unbelievably bad experience, and there is more I could talk about but these are just the highlights. Be especially careful with the 6th-12th axis in composite, when many planets are there it is almost certain not to work out well unless its a very spiritual connection.