yes, it is a very good price :-) but the board doesn't have USB 3.0 and SATA III 6Gb/sec. About the quality ... I have no comment since I never bought Asrock boards before.
about an open boxed item, usually the difference only in manual book and warranty. About manual book, you can just download it at the manufacturer's website. So the only thing left is please make sure that the warranty is the same as the boxed one.