I watched a few episodes in Japanese, which is my second language after English; the dub isn't terrible, and the voices sound normal enough for the characters.
I especially adore Fluttershy's voice, but I usually stick with English because that's what I understand the easiest
Do you watch MLP in your language? Discuss foreign dubs
in MLP:FiM Canon Discussion
I watched a few episodes in Japanese, which is my second language after English; the dub isn't terrible, and the voices sound normal enough for the characters.
I especially adore Fluttershy's voice, but I usually stick with English because that's what I understand the easiest