Not just DLP, but all rear projection TVs. I have the 981 and get macroblocking, but honestly, it's quite minimal. Sometimes it bothers me, but for the most part, I don't notice it all that much. The picture is absolutely stellar for well-mastered material, and the audio is no slouch either. I'm delighted with my 981.
jliedeka is correct when he says that the 980 is geared more towards audio and the 981 more towards 981. If you can afford the 983, hey, why not get the best of both worlds! It all depends on what your focus is, and what kind of TV you have. Check out the link that jliedeka provided; it has a comparison between all the Oppos, and they give recommendations near the bottom of the chart.
cheers,
supervij