Rotovac 360I Carpet Brush Head vs 4 Slot Head Want To Buy

Guys,
Does it clean that much better with the brushes I will be agitating with a CRB so If I am wasting my money and should just buy the 4 port head from TMF re-jetted please tell me!!!PLEASE GIVE ME YOUR HONEST OPINION..

Does anyone have a 360I Carpet Brush Head They Never Use Or care to sell one?
Does anyone have a 4 slot vacuum head or both
Does the carpet brush head fits under the regular shield or do you have to buy that vacuum ring?

Thank you Very Much