Just hooked up an 830 yesterday. It seems that every time they put out out a new unit, they take out features yet increase the price. This unit has no front display, no (red) recording indicator, they removed the component outputs and removed caller display functionality. The unit can do WiFi yet they included a wired ethernet jack (redundancy) which seems a waste. Unless you need WiFi for VOD, you are better off with the 630 from a cost saving aspect.
Also, when you turn it on, it has a bright white indicator light rather than the nice subtle green of past units.