I bought it to compare it with my other Tenore since some users have reported that there are variations with this model. I bought my first one from an Amazon seller and the new one from an ebay merchant. They sound exactly the same to me.
You buy the new one for $50 or the used one $45...and avoid the two week shipping time (that's how long the trip took from Japan to California).
I'm also willing to trade for another IEM (I can add some cash on my end to trade up).