I have an 830 and the bobbin changes are way less than other machines because of the huge bobbin. I just slide the tray over to the left. You just need to press a button to do this. Open the door and change the bobbin. I have NEVER found it to be an issue although, I did think it might be when I first started. Even when I am embroiderying, this isn't an issue the hoop moves out of the way, you change the bobbin and the machine goes back to where it left off automatically. I think this is a fantastic machine IF it is working. If you are purchasing new, then you have a warranty, but if this is second hand I would make sure that there are no issues with the machine. Fortunately I never had any issues that could not be fixed. Others however have had. If you have a dealer and service rep you can trust then you are good to go. I had my issues with phaff and personally would not go there, but that is my experience.