These are among the best ear-buds, and price to match. Cheaper than custom IEMs. I like them alot. There have been some posts b4. The sound is very similar if not identical to the non-clip-ons. Though as I mentioned b4 the clip helps lock in a little tighter so perhaps helps provide a little better seal, once ya get them set, which takes some adjusting til ya find the sweet spot.
Pair with a iPod, iHP etc... and portable amp and you will get some very good portable audio.
I needed the clips to keep them from falling out during inopportune moments, running for a train etc...
As always this is my opinion based on my experiences, your results may vary.
The clip can become tire after a while but not painful just noticeable, but would be at least an hour or two from my experience. After which perhaps your ears could use a break.