Does the HR21 offer any advantage over either the HR20 or HR22? I took advantage of the offer for long time customers to get a free HD DVR, with the thought of replacing one of my olders ones. I am inclined to keep the HR20 because of the OTA and because the HR22 is way slower. From what I have read of the 21 it seems some people have had issues with its slowness too. Of course the picture when you open the offer on the web site shows a nice new HR24 which is all I was really interested in getting. I think I will just call them and tell them I don't want the 21 and if they don't have a 24 I will just return it. It would replace an H25 which I have in conjunction with an HR34. I know I will have to buy another DECA to use the HR21 unless I decommission one of my existing HRs. I don't think it is worth it for old technology.