Anyone have recommendations or success stories for express/34 FW800 cards for their macbook pros?

I've got the earlier version of the 15" MB Pro that doesn't have Firewire 800. I've got FW800 RAID boxes I was using with my old powerbook, and now that I'm getting back into recording (with a firewire audio interface) I'm hurting on performance through the built in FW400 channel. Obviously that's also because I'm using a single channel for both these functions. I could try and sell it for a new one with FW800 built in, but I'd like to explore the expansion option first. Anyone have experience with this?

Reviews at lowerendmac and xceler8 your mac are confusing, conflicting, and generally unhelpful. But someone out there has to be doing this...