1. It only captures highly compressed h.264 video.
2. Its from Black Magic, which means it likely never worked right to begin with
3. It doesn't even have a standard S-Video plug, which every other vendor of SD capture devices will include built in.
Blackmagic Designs had a great reputation for their video software, and some early hardware, but that's it. Most of their capturing hardware suffers quality issues -- especially unreported dropped frames.
This device, as NJRoadfan has pointed out, has a several limitations that make it a poor choice.