Windows to open spaces in my back?
No thanks...
Added: Max_Horstmann's put them at your left or right approach also works for me.
But the real issue is that they transmit basically all the sound. Fortunately there usually aren't conversations going on just outside people's offices, but if two people are talking while walking down the hall or the person in the next office is yelling at folks on hangout, it's not much quieter than a cubicle.