I have a Q'nique 21 that I bought a year ago. At first it gave me some tension problems. I figured out that the bobbin case was not 'right', replaced it. No more problems. (Well, besides the occasional operator error!) It sews beautifully. I bought QCT4 Beginnings with it. Works well, although I would like more precise/verbose documentation.
I bought it from Allbrands in FL. Price was lower.