long firewire cable

I came across some 25 foot firewire cables at computerplug.com and while it all looks good I have read that the longest you are supposed to go is 15 feet or there will be substantial quality/signal loss.

I haven't had a chance to compare picture quality yet as today Wirecast and my laptop didn't want to play nice, video was not as smooth as it was before in previous tests so I was fighting with that all afternoon while talking to the control room on two phones and typing on the blackberry and working the laptop with my nose as we prepared for a live hit.

I am building a live webcast rapid deployment kit, got a Pelican 1610 case on the weekend and now have to fill it with everything I could possibly need so I have a live-truck in a box, complete with power and everything.

I am curious about any thoughts on the 25 foot firewire cables, I did a quick test and the laptop did recognize the camera but then things got seriously busy.

mark