How about OnLocation? (Works with FireWire.)
It would be nice to know what is the source your capturing from. But in general, yes, the Intensity Shuttle is a good device, and affordable for the features. Provided all you need is HDMI or component for HD, or s-video and composite for SD). It's perfect for cameras that don't have Firewire out, like many H.264 camcorders. And has Jim pointed out, OnLocation is perfect to capture form Firewire, but from the Shuttle as well.
The Intensity Shuttle is great as long as you have the up to date USB3 Driver and Firmware.