Quadrille - 1:29 pm on Aug 22, 2007 (gmt 0)

There's no real-time data, it's all user-submitted product feeds that they draw their results from.

I don't think that's true any more.

The smaller comparison engines rely 100% on submitted feeds, but the OP asked about the biggest of them - they have been spidering for a while, at least for larger clients.