I bought a bunch of the solid FQ packs when they were on sale a few months ago. I haven't used them but they seemed find to me. I don't anticipate any problems.
However, just a note. The reason they were on clearance and couldn't be back-ordered (some combos were out of stock) was because they were phasing out a few of the colors. Since the packs had appeared in the catalog already, they wouldn't be able to reproduce them exactly with the same colors.
So if you buy any of the clearance solids, don't expect to be able to reorder the same EXACT color in the future.