I'm a new Comcast subscriber - about six weeks now, and I have the DCH3416. Mostly, it works very well. The user interface could be better. You wonder if they do end-user testing with non-techies. Even this techie wonders if they are even trying to make things easier or just kicking something out the door as fast as possible.
One quirk on mine is that I get a recording of my local news broadcast on HD channel 104 every day even though it is not programmed! Another is the so called "series" recording which, for newscasts that repeat throughout the day, will record all instances of that program! I end up with three recorded shows every day all the same. In an effort to avoid that behavior I programmed for the specific time and channel - but when I look for that recorded program it does not show the program name, only the date and time. The programming seems rather limiting to me.
After doing some web research I found the Comcast remote is made by Universal Electronics and uses the same codes and commands as the "One-For-All" series and supports two other devices. Only problem is that I am going bonkers trying to find the codes for my Emerson LC320EM8AN 32 inch LCD HDTV made by Funai Electric. The remote requires 5 digit codes and Emerson is no help at all. After trying all the Funai codes, which include Magnavox, Sylvania, Symphonic and Westinghouse as well as Emerson, I tried sitting on the floor and "searching" for the proper code. It sure feels stupid punching the buttons repeatedly for half an hour and finding nothing works. There has to be a better way!
An additional quirk is that changing channels up or down may switch between HD and
SD channels and sometimes the Emerson seems to restart, just like the power had been cycled. It may be a quirk of the Emersson but I thought I would mention it here for information.
In addition to the 3416/Emerson I also have two smaller bedroom HDTVs for which I did not lease the Comcast set top boxes. After using the auto setup feature I get channels 2 to 99 and my local HDTV channels displayed, for instance, as 4-1, 5-1, 5-2, 7-1 and so on. In addition I get what appears to be a whole tier of digital versions of the analog channels with numbers RF102-9 through RF117-1210. Comcast makes no mention of these channels.