Because you get a black screen you don't recommend them?,It is supposed to work, as is the LGP Lite I have by using the "Stream Engine" Program and then selecting that as a video source. However this far all I've been able to produce is a black screen. I do know some people have managed to use Avermedia products successfully but personally can't recommend them.
Many large streamers use this capture card to take strain off of their processor. You can check out http://twitch.tv/lirik he uses OBS and has a 2 PC setup along with the capture card you stated and his streams are beautiful at source.