Only dipoles can transfer the atmosphere of the cinema sound par for par to a living room. The surround field for dipoles is broader and thus fills the entire rear area, whereas for direct emitters (normal speakers) you always hear the speakers directly. As direct emitters sound similar to the front systems, the atmosphere that creates three-dimensionality is missing as compared with the dipoles.
The disadvantages of dipoles are the necessity of positioning them on the wall (upwards of 1.40 metres) and the more expensive price. They usually cost more than normal direct emitters, as you require a double number of chassis to be used. For limits in price, the following general rule applies - better have good sounding direct emitters than bad dipoles.