The idea that a faction of Asgard broke from their brothers in the Ida Galaxy is sound in theory, but their complete disregard for the lives of non-Asgard civilizations in Pegasus bugs me. I.e. making Rodney activate the Attero device without regards to the galaxies stargates blowing up, or their experiments on humans, that led to Loki being punished for, etc. are just 2 things that bugs me about the Vanir. I can understand their need and desire to solve their cloning problems, but it seems it would be easier for them to abandon their technology and focus on trying to ascend. If they could've achieved that, they could've theoretically returned to mortal form without the problems of their cloning techniques.