Just gave 1.2.4 beta a try with my QAM card (Avermedia A180). It only partially (barely) works.
Easy HDTV is correctly picking up PSIP data for a few channels (the networks) and remapping them; e.g, it shows 2.1 as CBS HD, 4.1 as NBC HD, 4.2 as WNBC Weather plus, etc. However, Easy HDTV is not displaying any picture for these channels. It is only showing a picture for a couple of channels (the comcast preview channels, which are not so useful to watch )