Here are some first thoughts on the AM21. It's shiny. I put it into my equipment rack and it's a good thing it's not a quarter inch taller or else it wouldn't fit. It is bigger then I thought it would be. It's both wider and deeper then the H21. It's obviously the size of the DVR. It's a bad balance to put it on top of the H21 so I would recommend the H21 go on top of it. I took the OTA cable to my HR20 and put a slitter on it and had a couple 3 foot cables that I used to hook the HR20 back up and ran the other to the AM21. I didn't hook it up to the H21 yet, I'll wait for the go ahead/first CE that supports it. One thing I'm very interested in is to see how quick the channel changes are. The H21 is soooooo much faster then the HR20/21 in all ways it'll be interesting to see if that holds true once OTA is integrated. All in all looking forward to some good testing!