I ordered this one:
http://store01.prostores.com/servlet...-2-INCH/Detail (not affiliated). I demoed the Bernina one in the store, and this one works exactly the same, though it doesn't swing out, which hasn't seemed to make much of a difference for me, but it lacks a convience factor.
I cannot get perfect mitred corners. I find curves are still tricky too. But I've only used the thing twice. It is not a magic wand, and it will still take practice.
For me the $200+ of a single Bernina binder is just not worth it. The less than $40 I spent on this was a much better gamble!
I have a 430 and it fits it perfectly. I use my standard presser foot.
I don't think that binding put on totally by machine would pass a quilt judge test - but that is just a guess
I do wonder about this. They accept fused bindings now, and those are often over stitched by machine, on appropriate quilts. I would imagine if they were done by machine they would need to be absolutely flawless.