It is an interesting phenomenon that I attribute to the rabid behavior lately of demanding a particular channel at the expense of the ones that are felt to be last on that person's list.
Here is an example of the extreme and oblivious behavior:
SciFiHD - This channel was agonized over even though most viewers stated they wanted it for ONE SHOW. This means they will watch it once a week but complain about how Voom channels don't show new content more often than that.
Chiller - There is no CHiller HD channel but there is a demand for it even though MonstersHD is already up and this month the selections look quite good for the genre. Of course, Chiller SD shows older series type shows but those were not in HD and you can get the dvds.
As Pepper stated and is a very strong positive for Voom that I think should be carried to other HD channels:
"...no commercials, no constant channel logo, no popup ads for other programs, no stretched or upconverted content..."
One other observation from my perspective:
If you watch Voom on little tvs using the tv speakers, your experience is much like looking at the Grand Canyon on post cards while whistling.
If you watch Voom on a BIG SCREEN, ie... larger than 90", with a 5.1 surround sound system backed by 350 to 500 watts of 15hz subwoofer capability, your experience is quite different. The visual and aural treat that Voom channels provide weekly for those prime moments of home theater are an experience few other HD sources can match outside of a bluray disk.
Don't just watch HD - Experience HD.