My precious elderly Elna died and parts were almost impossible to find. No one close to home was wiling to tackle the job! (Interesting.) I had read the QB threads re machines. Oodles of information and good sense. I looked for years for a replacement. brand new or well experienced. After doing my "experienced sewing machine part of my research, I discovered Husqvarna Viking had the entire, as in every word, of the manual for the Husqvarna Designer Diamond Royale on its web site. I read the whole manual, considered what I had read and had experienced hands on, robbed a bank, and bought it. (The sale break was monumental.)
The DDR hasn't cooled off on my sewing table yet. Too much going on around me to do much of anything but keep re-reading the manual so I cannot tell you much about my personal, hands on in the middle of the night (favorite time to sew) experience. Also please keep in mind that I am a book learner.
Remember to look for support from a local dealer AND the manufacturer; both now and into the future. Both classes, parts, repairs, and projects. Remember to take a sample collection of the fabrics you usually sew AND the ones you would like to sew in the future if you buy this machine.
And lastly, plan on loving whatever choice you make. Attitude makes the difference.
No matter what, enjoy the ride.
Pat