If you are looking at porro prisms around that price I would suggest the Wind River Mesa 8x42mm ($150, excellent binoculars with a view of roofs costing 2.5 times as much), Pentax PCF WP 8x40mm ($130) or Bushnell Legend 8x42mm ($120). I've seen the Alpen Apex 8x42mm and they are as good as most of the other midrange roofs, but don't know anything about the 570 except I couldn't live with those eyecups.