Well, it all depends on what you have watched. If you watch the anime only, of coz it's off to you. But if you read all manga, light novel, and the anime, then it really doesn't matter to you at all (since they all have different style). XD
I like this show so much! And I can't wait to see the "Sisters"!!! =D
For those who wonder what "Sisters" is, you can check out some comic scan here
http://www.nekomagic.com/?p=1172
