I have a Minore with the vibe pump. Yeah its noisy and sometimes can be a little vibratory I dont quite get the cups moving around while the pour is going on, but yeah, switching to a rotary may happen sometime down the track.
I have mate who has the rotary and its great. Not everyone can accomodate the rotary setup so thats a reason I have mine as a vibe for now, as I do take it with me on trips etc, without having to lug a tank around, or hook it up etc.
The rattling is more prevalent when its cold, or for the first few shots. Once the system is well primed and warm, things dont tend to be as bad. And sure, its noisiest when its initially building pressure either on start up or at the first part of the shots.
Like I said, if I could accomodate the rotary right now, I probably would, but having the vibe is more a convenience at the moment, and neater as far as setting up in my kitchen.
Hope that helps a bit anyway!