I've looked at the binding attachment and am not crazy about it because it used a single layer instead of the french fold (double layer) I usually do. I struggled for years trying to sew it down by machine but it always looked ugly. This last year, I found this tutorial , now I can sew my binding on by machine using the flat felling (#71) foot on my Bernina (and this foot is cheaper than the binder attachment). I have been very pleased with this method and would use it for everything but a show quilt.
http://awomanaday.com/2013/01/17/hap...nding-edition/