Did you go with iSine or Monolith? I didn't want to shell out the additional dollars for iSine because I was on the fence regarding the overall design fit-up. I was particularly worried about the ear clips. I bought the Monolith M300s as a less expensive way to experiment with the very promising planar IEM concept. I also chose the M300s because I am really impressed with my Monolith M1060s. As I suspected, the ear clips were problematic for me. The Monolith clips are flimsy, break easy and were uncomfortable on my ears. We have a 3-D printer in the house so I set to work right away making custom ear clips. It took a few tries but I have those M300s right where I want them. They are comfortable, stay on well, and sound great. I don't feel a need to upgrade at this point because I am quite happy with the M300s. I will one day try the iSine 20s to see if it's much of an upgrade. If the 20s are a big improvement, I wouldn't hesitate investing in iSines now that I have figured out how to print custom ear clips.