Tim said it in a nutshell. I have my camera set up to take 3 shot bursts in manual mode. Since most camera's "simple" setting causes the picture to be overexposed, I take the series of three shots with two underexposed at two different settings, and the last one at what the light meter says is "right".
As far as being a sacrifice in quality, I don't think that it does. As Tim said, it becomes about "write speed". Buy at least one high speed card, and then I have at least two or three of the cheaper models floating around. I find that the cheaper ones, very rarely, if ever get used.
Winterhawk1960