What's a good partner? It's rare for a partner to satisfy all your needs, which is why I find this question to be very difficult to answer.
I'm happy with my wife and I wouldn't divorce her now, but if I could go back in time with all my current knowledge and be 20 years younger, basically my current brain in my 20 year younger body, I might choose a completely different life. Not because I wouldn't want to be with her but I probably wouldn't want to be with any woman for at least 10 years. I wouldn't settle, wouldn't live in the house that I'm living now, I'd try something else.