How is the software on the 721 running? I am sending back my 942 and dropping down to the 180 only. I am still very upset over the treatment on the 942 deal. So i am going to sit back and see what i want to do. I have in my closet the the 508 and the 721 just not sure which one to put back into use. The dual tuner is not that big of a deal for me.