Should I choose a vibration pump or a rotary pump?
Vibration pumps deliver a lower flow rate and a more gentle pressure ramp up so they are recommended if you are looking for the very best coffee extraction. However, rotary pumps are quieter. For the best of both worlds look at the Profitec Pro 500 coffee machine which offers vibration pump performance without the "vibe rattle."
Of course, if you want to plumb your machine in you will need a coffee machine with a rotary pump.