Yes. I've used them before.
I've used them as a meringue and although they perform, they just don't do it like the real thing. I wouldn't make an angel food cake out of them. They'll be workable as meringue cookies, but I wouldn't try to make a crust out of them.
For cooking, they're great. If you want to use them as an ingredient (as opposed to them being the star of the show) then they'll be fine. I've used them in things like zuchini pizza crust, as a dip for meats pre-dredging and as an egg wash for breads.
edit... oops... posted before I saw your post above.
Sorry... can't help you.