Pros: Cheap, nice sound, nice isolation
Cons: Not very comfortable, rather hard to find seal, flex a bit
Very good sound for the price, at least the one I paid. Good bass, good vocals if tad laid back, and nice simmering treble if tad bright.
Isolation is good IF you can get good seal. I had to adjust the IEM several time to find the seal and comfort. Use the bi-flange for the best isolation second only to the triple-flange.
The nozzle is tad smaller than the usual universal IEM so finding flange replacement is a pain in the a**. You could wrap it with those water pipe isolation (which like thin layers of white plastic) several time to the nozzle so it will fit those universal flange/tip.
The driver flex a bit, and the finish is ok. My IEM shine layer is flake after several month of hard use.
For the price? It's a steal, IF you could find isolation and it's comfortable for you.