You can buy a long arm with or without a frame, but most dealers bundle the LA and the frame and other accessories.
I have a HQ16 that I bought used in 2010. It works great; I have had no problems with the machine whatsoever. The operator (Me), on the other hand has often created problems through carelessness.
Carelessness usually means I'm tired or don't feel well, but quilt anyway. Maybe someday I'll learn...