1989. Westone Pantera.
Clublike neck and major neck dive.
After a 2 hour rehearsal, my left hand and wrist would hurt for a couple of days. I thought that I would get used to it, but after a couple of months, I was in constant pain. And the bass didn't sound very good either. So I sold it, and decided that I was a four stringer for life.
About 3 years later, Guitar Center ran a Christmas special on an Ibanez 6 for $699, which was about $500 cheaper than anybody had ever sold a sixer for at the time. I went and played it, and it was almost as easy to play as my four string, and had perfect balance.
I bought it and gigged with it the same week. I have been playing well designed 5 and 6 stringers ever since.