mono blocks for home theater?

I have always used various 5 channel amps in my home theater. It also doubles for 2 channel listening, 75% movies, 25% music. I now have a chance to purchase 3 mono blocks for the front and a 2 channel for the rear. I understand the benefit of mono blocks in two channel. I know everything is system dependent. Are there any pros or cons besides looking for extra outlets? Is it overkill? Will it improve movie soundtracks? Would I be better off upgrading elsewhere? Has anyone tried this and gone back to a 5 channel amp? Thanks to all who respond.