I own a pair of Sennheiser momentum truewireless2 earphones . They sound amazing provided you get a good seal.
I had to play around with the supplied silicon seals , a small twist can make a difference and they got uncomfortable after a half hour or so . It felt like the weight was levering down on one bit of my ears . I thought I’d give the comply ones a try and they’re a big improvement. They seal totally and distribute the weight evenly so they’re much more comfortable even over long periods. Not as good as moulding your own custom ones but very close too it with a lot less faffing about.
I’m not a great lover of in ear headphones, but I wanted a decent pair of wireless buds that were also noise cancelling. After trying various combinations of the supplied silicon tips I was left slightly underwhelmed. I couldn’t get a correct fit in my right ear and I was getting sound leakage which made the noise cancelling pointless. So after reading various reviews I decided to get a set of Comply buds.
The result is so far very good. More comfortable and because they expand in your ear they aged a fairly good seal which meant not only an improvement in noise cancelling but a noticeable improvement in sound, particularly the bass.
Yes they are expensive for what they are, but in the grand scheme of things they’ve brought out the best in a £250 pair of earphones. Very happy with the result.