A used i4 is only around €3-500 more than a used i3. These iems really don't have have driver failure from all finding I've seen. Mine has lasted 4 years. The difference between the 3 and 4 once you correctly use auto eq 20-6000hz is about 25% improvement in performance. The i4 is far more effortless in its presentation than the 3, much like the lcd4 is once corrected. Its like the difference between a almost spotless window, and no window at all. Like the driver is completly imperceptible, or is ethereal like a E-stat. None of these iems should be used without serious EQ like a qudelix. Their defult FR's are abominable, but the i3s is noticeably better than the i4. Like going from a E to a D+. Technical performance wise, it's going from a S- to a S+. For such a small difference on the used market, that is worth the jump every time, but absolutely not for $1500 more brand new. Its not that large.
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