As soon as they added magic and the Anglican Church to the scene, I was done haha. Too much to keep track of. And lacking in the wonderful yuri magic of Railgun. Not worth it at all to me, since I rarely pay attention to anything other than yuri. Also, I love Kuroko's voice actress, or perhaps just her voicing Kuroko, so naturally I can't watch something that barely ever shows her.
Also, I particularly like this doujinshi because it's not a sex-fest, but rather remains true to the humor of Kuroko's obsession.