I had an 50 Ill/Kin on live and rebuilt her on Rebirth. She's 50 now. I love her. She's a monster. One acc in the buffs/heal and I rarely miss.
My main issue with kin is the heal is mob centric and siphon power is caster centric. I love teaming with her, but if I need a heal, I have to get close to the mob and if I want to buff the melee, I have to be close to the mob. (However, after all this time playing with her, I JUST learned that I don't have to be near the mob to buff the melee with Fulcrum Shift.)
When I am soloing, the heal being mob centric helps heal my Phantasm without having to be close to him.
I like to confuse a minion and then siphon power from him at a distance, giving my Phantasm and Army a boost before the fight begins.