When I was buying my shaker motors I asked Terry if his were Factory Stern shakers and he said no. So the shaker motors from Pinballife are not factory Stern shakers just to clarify. I was looking for the factory Stern shakers because I had already tried the coin taker red tremors and I didn't like them, too buzy. I have never tried Terry's so I can't say. I ordered from Sterns webpage when they were running a sale and got the factory shakers for $120 each shipped.