Most of us don't buy our discs on e-bay, that is where you are going to run into media cloq, allow me to explain.
The sound choice discs with media cloq will not play in the combination players like my Pioneer DVD-V555 DVD-CD-CD+G unit, SOOO sound choice has stopped using media cloq untill they can get around that problem.
Most of us that now know that are stocking up, I just received three sets of foundation#1, and #2, and five sets of bricks 1-5, and 250 other misc discs and NONE are protected, so I have more on the way. The trick is to buy from a dealer(dealers sell cheaper than from sound choice) that has a quick stock turn over so you don't get old discs that still have the cloq on them.
We have four sets on the road, and I am planning two more soon, and another just for parties, SO now I buy so I can get good discs, back them up and put the orgional discs in the spare room.