> Redfin is disrupting the brokerage model of paying agents price-based commission. As far as I can tell, they are happy to use the existing MLS for listing data, and then put a nice interface on top of it.

Not only that, but they're storing the data forever. You can see every time a property is listed, the price changes, status changes to contingent, sale prices, everything.

You don't get that with the MLS system.