I just got one of these tonight. Very nice. I put it on instead of my DW helm. Im level 48, so Daring is still a spell I use, so it was nice not having to mem that, and the heal that comes with is really nice, and ofcourse, 4 more ac and the Valorium. But I dont think 4 ac is really gonna make that much of a difference. So Im usin the Valorium Helm, but Im gonna haul around my DW for (1) The look, (2) The manaless casting properties (3) Just cuz its DW =P
But for everyday use, Im thinkin Valorium is the way to go.