I didn't know either until I was looking to buy one and saw that the 16 GB - which had always gotten great reviews at Newegg - was now getting bad reviews for several weeks, all due to this changed technology. 8 GB drive was just starting to get the same when suddenly Newegg temporarily stopped sales. They were issuing RMA's for so many.
I ended up with a Kingston 8 GB Data Traveler 100 for $31.00!! Good enough speeds for my purposes!