CathyVV, on all machines you are going to feel some motor vibration thru the handles. This is not hard vibration but still you are going to have some sensation thru the handles of the machine.
When a machine and frame are balanced, you do not feel a great deal of vibration or "machine jump". I have my husband check the level on my machine and frame every couple of months.
I have the HQ16 and if I run it at a slow speed, 35% or lower, or if I have it at a high speed, 70% or above, I have very little sensation at all. But in between those speeds I do feel motor vibration in the handles.
I hope this helps you.