I am on a roll with these topics. I know I discussed this somewhere, because King Coin warned me in a topic about a bug with them after one of the game updates. But I have no clue where that thread is. So I am back with another thread.
Improved Familiars does what it says on the tin. Anyone who has ever used these fellas in vanilla Skyrim has probably ended up sighing in frustration. They cost a relative ton of magicka, and die if a baddie so much as breathes upon them.
Improved Familiars toughens the Familiars up some, and reduces the magicaka cost to summon them. They are still a novice level summoning, but at least they wont be one-shot killed by every wolf in the game.