I have the 830, it's about 2 1/2 years old now and I've had many problems with it. And I'm far from being alone or having a lemon. If I could go back in time and do it over, I'd buy a stand alone embroidery only machine and a long arm.
I love Berninas. I own about 10 of them-mostly vintage machines and they are wonderful. The newer 830 was a disappointment.
And just so you know, the 830 is being discontinued for the 880. So if you are going to invest in the newest top of the line machine, the 830 is no longer the TOL.