Yeah agreed, which is why I was a bit skeptical too, until I saw it was limited to 50k each of Xbox and PS3, which makes me think they may be using it as a market test for conversion into subscriptions or something else they have tucked up their sleeve.
I'll report back when I get mine through. Also it will be interesting to see if Chromecast will be able to pull off it's magic with this service or not, I doubt it, but hey if it doesn't work I'm not adverse to mirroring my laptop to the TV or projector via HDMI.