I just returned from the Houston Quilt Festival and took several classes on a variety of machines . . .and have to say, it just made me appreciate my BERNINA that much more! It's a 780, not 830 . . .but uses the huge honking "m class" bobbins and runs smooth as silk. One particular top of the line machine I sewed on (and it's sold for about $5000 more than my $9000 780) couldn't even sew full speed without vibrating so bad it was difficult to control the seam. There's a reason some of the best quilters in the world, choose Bernina and it's not because they're paid to endorse it . . .theyre simply fantastic machines. I'll be 52 in January and I'm confident my machine, used daily, will outlive me.