Xi6-T DVR questions

My Comcast DVR died and when I went in to swap it they only had the Xi6-T wireless DVR available.  So I have hooked it up and mostly I'd like to hear what others experiences have been with it. Do you like the wireless or prefer the XG1v4-A DVR better? Any tips for using this box?

I have run into two problems already. First is the MAC address it is transmitting isn't the same MAC address that is on the bottom of the box. Is quality control that bad? Second, I tried to pair a second remote with the Xi6-T but it wouldn't take. I have 3 remotes paired with my XG1v4-A box. Is there a way to pair a second remote with this Xi6-T box? Thanks