I agree that the Ethernet port is an advantage for the H21 over the H20. But I will disagree with you about the speed of the H20. While is was dog slow when it initially came out, software upgrades that came out later sped it up tremendously. When I got rid of my H20 about 2 months ago it was much faster than the HR20 I have which is faster still than the HR22 I got to replace the H20-600 I had.
You're right that you can get the AM21 OTA add on for for HR21 and HR22. However, as far as I know, the AM21 doesn't work with the H21. And the OTA tuner in the H20-600 is better than the tuner in the AM21. The H20-100 may be a different story, but the H20-600 had a tremendous OTA tuner.
You're right that you can get the AM21 OTA add on for for HR21 and HR22. However, as far as I know, the AM21 doesn't work with the H21. And the OTA tuner in the H20-600 is better than the tuner in the AM21. The H20-100 may be a different story, but the H20-600 had a tremendous OTA tuner.