I have a 707, a 730 and a 831. I noticed that even after being cleaned, oiled, etc. the 7 series are a bit more noisy and less smooth than my 831. Still very nice machine to operate and superior to many other vintage, IMO, but I just have the feeling there was some improvement in the enginering of the machine between each "generation". So maybe the 530, being older, is more "rough" than the 7 serie... I would for sure try it if the price was good, but I loooove Bernina...