I've got the 828, and its a great piece of gear. If you get this one, you will be happy. But this just makes the MKII that much better. The one thing that really kills me on the MKI is that you are only able to monitor one stereo pair of inputs at a time. Oh, whoops, cominginsecond already said that. Oh well. I wish I could do higher than 16/48 (or is it 24/48, I don't remember), that would be cool. Oh yeah, and the preamp inputs are on the front, which is nice for convienince. Plus I think that you get 2 more inputs, and word clock, as well. Overall, I would say that it would be worth the upgrade to the MKII.