When I was apprenticing in a cabinet shop, we used the #330, My dad gave me one for Christmas in 1987, I still use it daily. It fits my hand comfortably, the switch is right under my thumb, it is smooth, quiet and effective. You can sand flush to inside corners. I have used 1/4 sheet pad sanders by Makita, Dewalt and Black & Decker. I can't understand why anyone would want one, they are noisy, uncomfortable and vibrate.  The #330 is a truly pleasant tool to work with and one that will last for years of constant service.