I have no problems whatsoever with the idea of having to fiddle about with a pair of IEMs in terms of tips, cable, etc., in order to get the best out of them, as long as what I am doing isn't random. There are just too many permutations to be endlessly swapping about, hoping for nirvana, unless I am aiming in a specific direction - e.g., needing longer (as opposed to merely different) tips because the nozzles are short. Certainly not up to doing anything involving taking the things apart, soldering, etc., though. But happy to spend a few extra quid judiciously. In hi-fi terms these IEMs are staggeringly cheap, so no point "spoiling the ship for a ha'p'orth of tar".