There are a few features I wish the 440 had, which it does not.
I wish it had a larger bobbin and a low bobbin indicator. I don't mind the front load bobbin, but some people don't like that.
I wish it had the tie off and auto-snip of threads when you come to a stop -- I think Pfaffs do that?
I wish it had the larger harp to make it easier to get a larger quilt in there (though I have successfully free motion quilted a king size on mine.)
But all told, I think a read through of this thread shows that the vast majority of people love theirs and find it a great investment.
RST