I have the 820, and I agree with Candace. Once you get use to your machine, changing the bobbin with the table on is not a problem, as you get use to the feel of it, and there is only one way to put the bobbin on. There are so many user friendly features. There is also a tool included to help thread the bobbin. It looks like a dentist tool, but the mirror on it allows you to look underneath to see if it is threaded right. However, as I said before, once you get use to the feel, and you can feel the thread "click" into place, you won't need the tool. I love my 820.