I use these speakers all the time as rear centre speakers in my surround set up. I find them really suited for this purpose.
They voice quite well compared to my B&W DM601's that are the main surround sides. Their bipole design means that they disperse the sound well which avoids too much localisation making them ideal in any surround speaker position.
They are nice lookong speakers in this beech and silver finish and suit modern rooms well.
If you can pick some up cheap enough I would highly recommend them.