The 1st season starts out like your typical Key dating sim (guy protagonist getting close -not dating- to each of the heroines) and concludes with him pursuing further relationship with the main heroine. The 2nd season ~After Story~ is where the fully fleshed twist/storyline occurs.Something to keep in mind in case you are expecting to be blown right away from the first episode.
Xam'd Lost Memories was great too. It may not be the top in terms of plot depth but the subtle plot revelations and suspense are well done. I picked this up because the OSTs were composed by the same person who worked on the first FMA run (Michiru Oshima). I was not disappointed and very much loved the dramatic presentation.
Finished The Disappearance of Haruhi Suzumiya and thoroughly enjoyed it. It's how the second season (disappointing) should have been. It's also nearly 3 hours long, which is very rare for an anime movie, but very well-paced nonetheless.
Started Nichijou recently and have been laughing myself silly. May not be worthy enough to dislodge Azumanga Daioh as the jokes are often overdone but it's still an enjoyable comedy show.
Shouldn't be the case. I personally find the Sextett to have syrupy mids and less bass extension/punch than the HD-600. The latter also reveals significantly more detail.Either there is something wrong with your HD-600 or you received a superb-sounding pair of Sextett. Regards.