MinosThe Burrow Econ quilts are meaningfully heavier. Our regular quilt has the same width as their "wide". Our fabric is lighter and has a nice feel to it. I've read numerous reports that it's hard to get a good seal on the foot cinch. They don't include straps for attaching the quilt to your pad and eliminating drafts - and we have two removable straps.
Finally, the biggest difference is that the Burrow quilts use horizontal baffles, which means the down can shift. I can't think of reason you'd want down to shift on a quilt. You can affect temperature through the variable girth of the quilt and easy venting. There used to be the idea that this was good for sleeping bags, but I don't think that is supported so much anymore, and it definitely doesn't make sense with a quilt. This applies to all Burrow quilts - econ and regular.