Yes, I have two teachers!
The reason why I have two is because I decided to continue with my private teacher after I got into music at university.
I find that the teacher at university and my original teacher very rarely contradict one another, and often I end up hearing the same thing about my playing from both teachers in the same week. That's actually a good thing, because then I really pay attention.
The reason why my two teachers are similar might have something to do with both of them having graduated from the same place, though they don't actually know each other at all. Or it might just be that good teachers would say the same thing the whole world over.
Even though the two teachers say similar things, they very often pick up on different deficiencies in my playing, so that's good. Also, one is more concerned with my technique, and the other one with interpretation.
So, I say, go for the two teachers if you think it will be good for you, because I'm finding I'm improving so much more now. That might have something to do with me practicing twice as much as I used to, though.