The modern blue-tooth earbuds are a marvel, and the TOZO NC9's are are phenomenal steal of a value for the plane and sound great to me. For a traveling guy on an airplane, they are a GodSend, and the music quality to me is remarkably good. At about $35. They have essentially no NRR though, unfortunately. Whereas the Walker units have 22-25 NRR (depending on what your read), which would be great as a cross-purpose item. But apparently have a terrible reputation for problems.
I'm curious, has anyone tried replacing the tips on a set of TOZO's with something with a better NRR? I'd like to learn more on that, if so please!