Welp, I went ahead and picked up a box. Same problem with these as with the Immation 100 pack deal from OM awhile back - throw the disc in, burn it, completes and says "burn successful". Pop it out, look, can't see any burnt area. (I know, some discs are harder to see than others, but these I can't see the transition at all). Throw the disc back in the burner, it takes a minute or so and finally recognizes it, but reads slowly. Plextor won't read it at all. DVD player (VCD disc) coughed and sputtered before finally giving up completely.
I've used a fair number of CMC discs over the years from different places without trouble. But whatever dye/process they're using at the moment just isn't working for me. My burner's a Ricoh 6x4x32 which has seen only light use and likes other discs fine, just that Immation spindle and these that it chokes on.
If you missed out on this it may be for the best.
--Mc