Anyone who buys a Hauppauge is a fool (and yes, most streamers out there are FOOLS). Hauppauge does not use DirectShow when their input feeds; which means you can't view the video directly in your preferred capture program like VirtualDub, Wirecast or FMLE. This is why you see a lot of streamers using screen capture software to output the video. What they are doing is viewing the input with Hauppauge's shitty WinTV software, and then screen capturing the view.
If you're doing this, you are losing a lot when it comes to quality and can lead to a lot of aliasing. Out of all consumer level capture cards, the Blackmagic Intensity Pro is the only one I've found that can do high definition, HDMI and uses the DirectShow interface. You would be a FOOL to buy the Hauppauge just to save yourself $50 as it will give you more trouble in the end as they are in fact NOT easier to use. Easier to hook up, yes, but not the use.
Not to mention, the HD-PVR is a sham. It claims to do uninterrupted HD, but this is simply not true. It is impossible, yes IMPOSSIBLE to send HD video over USB2.0; there is just simply too much data going through the pipes. So how does the HD-PVR do it? It doesn't. It takes the HD signal, compresses it, sends it over the USB2.0, then decompresses it at the other end. Which of course means a massive loss of definition and quality.