I'm sewing with no problems at all on the original Bernina 830 record that was my college graduation gift from my parents in 1975. I have it cleaned (fairly) regularly and it is wonderful. It sat, unused, for about 10 years (while busy with kids, teaching, etc.). Had it cleaned and replaced some soft rubber part that had hardened... purrs right along..... love, love, love my Bernina.
Just last week, it wouldn't pick up the bobbin thread. I called my usual dealer in OKC, but they were closed due to ice and snow. So I googled Bernina, called the first number and a really nice dealer in Utah helped me solve my minor problem (which was user error) sheepish grin... ended up sewing all day!!