I have a Brother SE350 (bought weeks before I heard about the SE400 with USB) - would have liked the USB - - but my SE350 has been golden. It is a combo sewing and embroidery machine. I have other machines as well, but I like the auto-thread cutter, the size and weight of the machine - it is easy to carry downstairs if I want to sew down there for the day - it has been a golden machine.
I have heard complaints that Singer (no matter who sells them) just aren't the same machines any more. They used to be sturdy workhorses.
Marysewfun