A bit belated reply, but I don't check the forums very often these days.
The Wings Slipit is my favorite Byrd; it fills a sweet slot between the Dyad and Dyad Jr. size-wise, and while it doesn't have the traditional Dyad super pointy tip on the PE blade, it's a very practical useful design. I'd love to see it come back in some form.
The big Wings, on the other hand... the first one I got back when was one of the few knives I had to send back because of QC issues - it wouldn't lock up reliably and the handle was warped. The replacement wasn't much better. That model just seemed to suffer from build issues and sloppy tolerances. Wasn't impressed, plus it makes the chonky Dyad sprint from a few years ago look lean and svelte.