Oppo supports the warranty with NuForce.
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I have both, both only significantly alter the two channel outputs, and the NuForce is definitely more open and dynamic but also outputs a slightly higher level so a perfect A-B isn't possible. FWIW I do think the price difference is worth it, if you want a good blu-ray player and solid CD player in one. If you are going to just use the HDMI output then gfo with the base Oppo 83.