Um, yeah. So every attempt I've made for ribs with sous vide (admittedly only twice) didn't work out so well. There's just something wrong with the fat not rendering properly...it comes out kinda slimy, for lack of a better word. The flavor is good, and the meat is tender, but the fat ribbons just aren't right. I hope yours turns out better.
For me, sous vide is really only handy for fish, and if your doing a lot of tenderloins for company.