Wow this thread is going quick, in response to power plates you may be suprised but we found they do have a place, it isnt where you think though
The muscle gain was significantly improved in secondary muscle groups for primary movements ie Lunges primarily work the quad, hamstring and Glute the power plate didnt work these as effective as say a weighted lunge but worked the sartorius, rectus femoris and other secondary muscles much more effectively.
Its definately better than what i thought was going to be said although everyone agreed the whole "work out for 10 minutes on a powerplate is the equivalent of 30 minutes exercise" is rubbish.