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This review is from: Comply Tx-500 Isolation PLUS Earphone Tips - (S/M/L) Black (Electronics)
You do need to understand what you're buying and how to correctly use them, but it's well worth it. The sound isolation is amazing, which really improves the sound of any compatible IEM's. These are a far better upgrade than buying new IEM's in fact, they can really transform the sound and fitment, allowing you to enjoy higher quality audio, with better clarity and definition, at lower volume levels (which has to be good for your safety).
Just learn how to use them and be patient. You do have to roll them between your fingers, insert carefully and hold in place to allow the memory foam to expand and take the shape of your inner ear. Once done - and it only takes 20-seconds absolute maximum - you'll get a wonderful fit.
Just don't try and wash them, they then stop fitting properly...