There are both good and bad points to this. When I first started, I had 2 instructors (and very occassionly had a third).
It was good in a sense as I got 2 different training methods and different tips from both of them with different perspectives.
The bad side is that I kept having to change the way I flew. The instructors expected slightly different way which were opinionated but 1 instructor did things a little differently than the other and each didn't really agree with how the other one did it. Neither were right or wrong and just preference.