Travel to London on British Airway Speedbird Fare

Has anyone traveled on this positive space pass on British Airways? Is it easy to travel on? Chance of getting bumped even though it's positive space? We are going to try to travel end of July with family of 5 from Texas (DFW) to London. Any suggestions?

With adding on the taxes and stuff, I don't think it is that big of a deal.

I would try Travelzoo.com for a better deal for a real ticket!! Or just watch for BA's summer deals.

Good Luck.....