It does still work - I am recording shows now from KOMO sucessfully OTA. They all show up in the dir with a title of Important Info but it is easy to figure it out.
I just picked one up at costco in Seattle, WA (Tukwilla store). They had 14 - now there are 11 left. $489 plus tax. Brought it home and put it in place of my 721 and had the upgrade to 2.11 and activated and complete guide in about 1 hour.