Unfortunately, I did not get to hear the Focal BE with rock music. But with the classical music at demo, the soundstaging and the dynamics was incredible. I have no reservation if it could rock, with the kind of dynamics and transient heard it definitely rocks!
The main problem I could see with anyone thinking about the BEs is this, are you other equipments on the front good enough for it? i.e. amps and HU
The BEs are not very forgiving to poor front end equipment and will take no prisoners. It will show all your equipment strenghts and weaknesses easily.