These are more expensive than most on the market. Still, you end up saving money because T9 is nowhere near as fragile as the other kinds, and the detachable cord means that you don't have to replace the earbuds every time the cord is damaged; you simply detach the cord and send it in for replacement.
UiiSii T9 and this uses 1 Passive driver, 1 Dynamic driver, and 2 BA drivers, with this model, you get dual dynamic drivers who are better for strong bass, and double faster response and more detailed sound in the same time because of BA drivers.
Overall, the sound on these is very high quality and very fun to listen to. They are comfortable and have stood up well to regular use.