I have the E98 A1 version of the Faema, its a rotary pump (in built tank or plumbed) and volumetric.
Its built like a tank. I love its refinement and low noise due to the pump, but the cooling flushes are a bit of a pain. My understanding not much can be done to resolve this.
I often think about swapping for a traditional E61 machine, mainly as they are a bit smaller and more blingy, but also due to the properly calibrated ones running at the right temp (from the stuff I have read here).
It would be good to see a comparison of these two if you end up getting it.