Actually, I think they're made by Janome. The 210 is a Janome Jem, 510 is the Janome 1600, and I forget the model equivalent of the 710 (I think it's one Janome has discontinued, but not certain) .
In any case, it seems to have been a short-lived venture! I believe Angela Walters is a HandiQuilter spokesperson, so she likely did get the machine as a promotional item.