If connected / disconnected the proper way, there isn't any problem.
However, the pentas are tricky to disconnect/connect at the speaker end, with tilting needed, so I guess, the manual suggest you leave them connected because of this?
-Andreas
BLab5, BLab5000, BLab8000, BV10, BS9000, BS3, Beo5, Beo4, BLink1000, BLink5000, BLink7000, A2, A8, Form2