longest firewire cable for 002?

[cheese2]

I'd like to take a quick survey of people who are using firewire cables longer than the one that shipped with their 002 (or 002 Rack, I suppose) What sort of issues are you having, if any? Where did you get your long cable? Are you using repeaters and/or hubs? I know digi has only tested up to 12' and the official 1394 spec is up to 4.5m (about 14') but a number of companies make cables very much longer. I have seen them advertised up to 70' but with the caution that they are only to be used for DV cameras. What difference does it make? Is it a power thing? Is anyone using these "camera only" cables with a 002? I will need about 40' for my setup.

Thanks.