Hello fellow head-fi'ers. This is my first post so I hope I can be of some kind of usefulness to you all. I'm new to the game but I'm jumping all in.
I almost sent my m300's back to Monoprice. I actually picked them up because my initial problems with these (comfort) was what I was worried about with the iSines. They sounded great but what use is that if you can only wear them for an hour or two? My black clips broke, the included cable was heavy and the eartips felt unwieldy. At first I attempted to switch to Comply tips... no luck. I thought they still felt fatiguing so I addressed the next issue, weight. I bought a new mmcx cable through amazon and I finally felt like I was making some progress. At this point I was at about 3-4 hours of listening before needing to remove them. Mind you that they were getting to unbearable around that time. Lurking through these threads I found the memory wire solution. "Problem solved!" I thought. Well, not so much. It helped but I just never looked forward to putting them on my ears compared to some of my over ear cans. I ALMOST tossed in the towel at this point.
Enter Amazon. Searching through earhooks I came across these babies
https://www.amazon.com/gp/product/B075K59NDV/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1. They sent me the smallest size connectors (not what I ordered but I think the largest size may also be too small) and I sat down for a little doctoring. I simply cut the original earhooks just above the semi-circular area, pulled the corresponding parts out of the new silicone ones and swapped them out. They do sit a bit higher than the Monoprice hooks so you may need an exacto knife and some extra time if your ears are a little smaller but these things are incredible. I paired this with the new lightweight cable and Spinfit CP155's and I can't be any happier. In fact I'm looking into some Unique Melody ME1's and hopefully I can splurge on some lcd i4's by the time my birthday comes around. I'm seriously loving this in-ear, open back planar thing. It suits my lifestyle incredibly well and my over ears may take a backseat for 2018. If I can't birthday surpise myself with the i4s I'm going with some Auteurs though. I hope this helps someone out. It's an incredibly quick fix, very easy and supremely comfortable.
Cheers!!!