I have a White Rotary and it sews like a dream, so quiet and smooth. I also have a Minnehaha made by National, with the "vibrating" shuttle. It works just fine, but it's a noisy little machine. Just the noise of the shuttle moving back and forth, clickety-clack-clickety-clack. I have a soft spot in my heart because it was the first treadle I owned. The Shuttle machine is easier to clean. Once you take the bobbin case out, it's all open, not as much room for lint to gather. I'd say the drop in bobbin has its advantages because there is no case to lose. I have a New Home and without its bobbin case, even though it works perfectly now, It's useless.