"Stuck" with them, like they suck? \:\) Yes they could be used as rear speakers, assuming you have enough distance between you and them. Also, there is no breakin time on speakers, so the m80's will sound great right out of the box, and the same 5 years from now.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85