I've shied away from the X1 boxes because of the reported problems, at least until Comcast gets the major bugs worked out. I use the Whole Home DVR system, but with 2 DVRs and 2 subboxes. I can record 4 shows at a time (2 on each DVR), and pause and rewind live TV on those boxes. In the rooms with the 2 subboxes, I can watch any of the programs recorded on either of the DVRs, although they can't pause live TV.
The biggest glitch I've had is sometimes the listing of recorded programs gets mixed up when I'm recording onto both DVRs at the same time, so the program will be recorded but the wrong title is listed. I also can't watch shows on the DVR that were recorded on the other DVR.
It's not the most elegant system, but still preferable to me versus the crappy U-verse PQ I had previously. Plus, I have buffers for watching two live football games at the same time which I didn't get with U-verse. I realize that may not be important to a lot people, but it's a big deal for me. I don't know how the cost compares to DirecTV, but it was about a wash compared to U-verse.