Hey David,
I can't help you with the converter you have but I can tell you what I've learned so far. There are two types of converters that seem to be top of the line. The first is Dazzle. The second is Miglia. I just got a G5 with Final Cut Pro 4 and I'm planning to buy the Miglia Director's Take 2. Check it out at www.miglia.com.
The rumor on the net is that the top of the line Dazzle, which converts Analog video to DV, hiccups and has incompatibilities with some systems and OS's. It sounds like the Migila is the poop. I'm buying it this weekend so I'll be glad to let you know how it works out if you want the scoop on it. It has analog, s-video, and firewire connectors. I believe it's 400 firewire. About as fast as you need to get for DV. At least for the amateur poop I'm doing.