I've got wings for my FXone. My weight is anywhere from right at minimum weight, to five pounds over. Unless it is blowing really hard they aren't worth carrying around the extra weight when racing, even then I'm not sure they are worth it. But I almost always use them when just out screwing around.
The biggest downside about sailing it both ways is that you really need to have two sets of sheets for everything. I've got everything trimmed down for sailing with out them, and that extra two feet of width becomes a hassle then.
I have yet to trap out with the spinnaker up in any big wind with the wings too, I'd like to add a foot strap before getting too crazy about it.
Hobie also no longer has them for the Euro boats, they've been discontinued.