I just did all the quests for Arniel in college of winterhold,Gotta say that was kinda fun.
And now i have keening,And he sounded suprised that i could weild it,but he can weild it too.And yeah you know what happens if you have completed this quest.
I Guess everyone can use it becouse it got disenchanted or something? I am still confused,what happened to keening? And is there any way to Recharge it? :/
Still cool that keening is in the game.
And i know you need wraithguard etc to weild keening.So this was a suprise for me.
/stordrage
Keening is bugged, the number of charges is set to 0, so you can't recharge it.
When I did the quest, it was bugged as heck for me, I had Barbas barking the whole time, Drevis Neloran kept telling me I had to leave, and the weirdest part was Arniel didn't even use Keening in his experiment, he somehow got a hold of a draugr greatsword and used it instead of Keening and it still worked

Here's the video if you are interested: http://youtu.be/380MLqSYcac