Not a complaint, since being able to transition with summons at all is SPECTACULAR, but there are repproducable oddities I've noticed on a totem Druid (wolf).
When with a swarm, transitioning servers DOES bring them with you, complete with (most?) spells cast upon them, but two things happen.
1.) You lose one. I haven't determined which of the four yet, because they all look the same when they're wolves
2.) Their (visual) size modifier goes back to normal wolf sized, not the cart-sized monstrosity I've grown to know and love. XD