I have no idea how good they are.  They are Maxell, and they work fine.  I wouldn't know how good the quality is because I make tapes and send them to people.  I don't have time to listen to them to check them.  No one has ever complained about them or commented on the quality of them.  A tape is a tape.  I don't know that there is any difference in any of the tapes.  There was one brand that would drag.  These do not drag.  They go through the recording cycle smoothly.  They were a good price, and came quickly.  I will certainly buy more of them if I need more.