Some rocker switches aren't true rockers, you just tap the top to turn them on, and off to turn them off, but they always return to the 'center position'. The more expensive switches are usually better, as they simulate the rocker feeling (by making it feel/sound like a rocker), while the cheaper ones (such as the ones made by X10) don't make any sound at all, and don't feel great at all. I assume that this is what they are talking about.