I have a Bernina 630 without the embroidery unit. I LOVE, LOVE, LOVE this machine and don't think I could ever give it up -- even as a trade in toward their new HUGE 830.
I wrote a review of my machine on my sewing room photos if that helps. The interface with the 430 and 440 are different but be assured these are ALL high quality (very well built) machines.
Here's what I have to say about my sewing partner, the 630:
http://www.flickr.com/photos/athomesewing/2720227176/