I have the Janome 8900, which is similar to the 8200. I actually went to buy the 8200 and they gave me a better deal on the 8900 with the trade in I had. I've had it for just over a year and I really like it. It just went in for its one year service and the only thing it needed (other than a good cleaning) was a slight adjustment of the auto tension. It's a dream machine!
I can't speak to the Bernina; I've never even tried one so I can't make any kind of comparison between the two.