These shoes are sick!!! I have been climbing in them for about 3 weeks, the break in period was a little rough but not too bad, after 4 or 5 times climbing in them in the gym they broke in pretty well and became a lot more bearable. They have a much more aggressive camber and toe hook than the Anasazi VCS, so this is going to be more of a steep wall/bouldering shoe than the Anasazi VCS which is a very solid all around shoe with little to no camber. They have a very tight heel that nearly forms a suction cup perfect for heel hooks. The camber on the sole makes them great for people with higher arches. I have found these are great for edging and toeing in on overhanging walls, but on slab the camber makes them more difficult to smear with. These are an awesome shoe for anyone looking for an agressive bouldering or sport shoe for climbing overhung walls.
As far as sizing goes I would recommend sizing down a half size from your street shoe size of you want a very agressive fit. My other shoes are the 5.10 Anasazi VCS and for those I sized a full size down from my street shoe for a very snug performance fit. With my Arrowheads I only sized down a half size because they run very tight on account of the narrow last and the fact that they have a cambered sole and a fairly agressive toe hook which both cut down the volume of the shoe quite a bit. At first I thought even going a half size down might have been too tight but after they broke in a little bit they were perfect, still very tight, but perfect for what I was looking for in an agressive bouldering shoe.