My HF5's are slowly dying so it's time to either replace or upgrade. I have enjoyed my HF5's because I like fast, precise bass and don't want anything with a "slower" sound. I seem to like the idea of spending less on their replacements but the lower-tier model, the MC5s, were adjudged as having not only more bass but looser, less controlled bass, so I don't think I want those. I seem to also like the idea of upgrading, so I looked at the ER4P's which I understand to be the mobile device version of this model as they have a lower input impedance. When discussing which ER4 is right for the consumer, Etymotic describes them as having: This causes me to wonder if I will notice much difference between my HF5's and the ER4's. My case against the ERP4's is that in comparison to the HF5's, the ERP4's also: * have non-removable cables * have microphonics even though they have a braided cable * need the ERP "S" adaptor and more amplification to sound superior to the HF5's My case for the ERP4's is that in comparison to the HF5's, the ERP4's: * have less cable memory from braided cable * are overall more sturdy than the HF5's Am I right? Am I wrong? I actually want you to argue with me. I've never listened to the ER4P's at all and have no way to compare. Necessary to mention is that my "rig" will include: lower mobile devices only such as my Sansa Clip+ and my Nexus 5 no additional DAC or amplifier 320kbps MP3's Popular music- Alternative Rock, Heavy Metal, and "Technical Brutal Death Speed Metal" No AK240 or library of 24/192 symphony tracks for this plebian. Just The People's gear. Feedback appreciated. I would like to place my order for either 'phone by the end of the week.