I purchased a number of products from Yongnuo in the past few months: original YN506, and the RF-602 wireless triggers. The price, being China grade quality, is low but surprisingly I have been happy with the quality. I decided after buying a Vivitar 285 off eBay that I want to pickup another Yongnuo flash. I wanted to cover the key, fill and background lighting that I was learning in school. A quick search lead me to the new YN 560-II! I have had this flash now for a few weeks and am very happy with the quality and recycle speed. Certainly worth the $70+ I paid for it. These flashes do not support TTL but are certainly worth the money for a manual flash.
DIY Photography Stuff released a review that, in my opinion, clearly describes the 560II and thoroughly discusses the pros and cons.