I noticed the "Buy It Now" listings on eB*y for EOS to NEX, Nikon F to NEX, and Leica R L/R to NEX, all same price, $300 each including shipping from China. It says "more than 10 available" so looks like they are shipping now. Has anyone had experience with one, and perhaps compared it to the others (Metabones, Zhongyi, RJ)? Their description states "works best with wide angle lenses." Curious how the in-between price niche translates into image quality.